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 | |
Trond Myklebust | 126e216 | 2010-05-13 12:55:38 -0400 | [diff] [blame] | 60 | #define GSS_RETRY_EXPIRED 5 |
| 61 | static unsigned int gss_expired_cred_retry_delay = GSS_RETRY_EXPIRED; |
| 62 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | #ifdef RPC_DEBUG |
| 64 | # define RPCDBG_FACILITY RPCDBG_AUTH |
| 65 | #endif |
| 66 | |
Kevin Coffman | 725f286 | 2010-03-17 13:02:46 -0400 | [diff] [blame] | 67 | #define GSS_CRED_SLACK (RPC_MAX_AUTH_SIZE * 2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | /* length of a krb5 verifier (48), plus data added before arguments when |
| 69 | * using integrity (two 4-byte integers): */ |
Olga Kornievskaia | adeb813 | 2006-12-04 20:22:34 -0500 | [diff] [blame] | 70 | #define GSS_VERF_SLACK 100 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | struct gss_auth { |
Trond Myklebust | 0285ed1 | 2007-06-27 14:29:12 -0400 | [diff] [blame] | 73 | struct kref kref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | struct rpc_auth rpc_auth; |
| 75 | struct gss_api_mech *mech; |
| 76 | enum rpc_gss_svc service; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | struct rpc_clnt *client; |
\"J. Bruce Fields\ | 34769fc | 2008-12-23 16:16:37 -0500 | [diff] [blame] | 78 | /* |
| 79 | * There are two upcall pipes; dentry[1], named "gssd", is used |
| 80 | * for the new text-based upcall; dentry[0] is named after the |
| 81 | * mechanism (for example, "krb5") and exists for |
| 82 | * backwards-compatibility with older gssd's. |
| 83 | */ |
| 84 | struct dentry *dentry[2]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | }; |
| 86 | |
\"J. Bruce Fields\ | 79a3f20 | 2008-12-23 16:10:52 -0500 | [diff] [blame] | 87 | /* pipe_version >= 0 if and only if someone has a pipe open. */ |
| 88 | static int pipe_version = -1; |
\"J. Bruce Fields\ | cf81939 | 2008-12-23 16:10:19 -0500 | [diff] [blame] | 89 | static atomic_t pipe_users = ATOMIC_INIT(0); |
\"J. Bruce Fields\ | 79a3f20 | 2008-12-23 16:10:52 -0500 | [diff] [blame] | 90 | static DEFINE_SPINLOCK(pipe_version_lock); |
| 91 | static struct rpc_wait_queue pipe_version_rpc_waitqueue; |
| 92 | static DECLARE_WAIT_QUEUE_HEAD(pipe_version_waitqueue); |
\"J. Bruce Fields\ | cf81939 | 2008-12-23 16:10:19 -0500 | [diff] [blame] | 93 | |
Trond Myklebust | 5d28dc8 | 2007-06-26 19:18:38 -0400 | [diff] [blame] | 94 | static void gss_free_ctx(struct gss_cl_ctx *); |
Trond Myklebust | b693ba4 | 2009-08-09 15:14:15 -0400 | [diff] [blame] | 95 | static const struct rpc_pipe_ops gss_upcall_ops_v0; |
| 96 | static const struct rpc_pipe_ops gss_upcall_ops_v1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | static inline struct gss_cl_ctx * |
| 99 | gss_get_ctx(struct gss_cl_ctx *ctx) |
| 100 | { |
| 101 | atomic_inc(&ctx->count); |
| 102 | return ctx; |
| 103 | } |
| 104 | |
| 105 | static inline void |
| 106 | gss_put_ctx(struct gss_cl_ctx *ctx) |
| 107 | { |
| 108 | if (atomic_dec_and_test(&ctx->count)) |
Trond Myklebust | 5d28dc8 | 2007-06-26 19:18:38 -0400 | [diff] [blame] | 109 | gss_free_ctx(ctx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | } |
| 111 | |
Trond Myklebust | 5d28dc8 | 2007-06-26 19:18:38 -0400 | [diff] [blame] | 112 | /* gss_cred_set_ctx: |
| 113 | * called by gss_upcall_callback and gss_create_upcall in order |
| 114 | * to set the gss context. The actual exchange of an old context |
Stanislav Kinsbursky | 9beae46 | 2011-12-26 15:43:57 +0300 | [diff] [blame^] | 115 | * and a new one is protected by the pipe->lock. |
Trond Myklebust | 5d28dc8 | 2007-06-26 19:18:38 -0400 | [diff] [blame] | 116 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | static void |
| 118 | gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) |
| 119 | { |
| 120 | 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] | 121 | |
Trond Myklebust | cd019f7 | 2008-04-17 17:03:58 -0400 | [diff] [blame] | 122 | if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) |
| 123 | return; |
Trond Myklebust | 7b6962b | 2008-04-17 16:53:01 -0400 | [diff] [blame] | 124 | gss_get_ctx(ctx); |
Eric Dumazet | cf778b0 | 2012-01-12 04:41:32 +0000 | [diff] [blame] | 125 | rcu_assign_pointer(gss_cred->gc_ctx, ctx); |
Trond Myklebust | fc432dd | 2007-06-25 10:15:15 -0400 | [diff] [blame] | 126 | set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
Trond Myklebust | cd019f7 | 2008-04-17 17:03:58 -0400 | [diff] [blame] | 127 | smp_mb__before_clear_bit(); |
Trond Myklebust | fc432dd | 2007-06-25 10:15:15 -0400 | [diff] [blame] | 128 | clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | } |
| 130 | |
| 131 | static const void * |
| 132 | simple_get_bytes(const void *p, const void *end, void *res, size_t len) |
| 133 | { |
| 134 | const void *q = (const void *)((const char *)p + len); |
| 135 | if (unlikely(q > end || q < p)) |
| 136 | return ERR_PTR(-EFAULT); |
| 137 | memcpy(res, p, len); |
| 138 | return q; |
| 139 | } |
| 140 | |
| 141 | static inline const void * |
| 142 | simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest) |
| 143 | { |
| 144 | const void *q; |
| 145 | unsigned int len; |
| 146 | |
| 147 | p = simple_get_bytes(p, end, &len, sizeof(len)); |
| 148 | if (IS_ERR(p)) |
| 149 | return p; |
| 150 | q = (const void *)((const char *)p + len); |
| 151 | if (unlikely(q > end || q < p)) |
| 152 | return ERR_PTR(-EFAULT); |
Trond Myklebust | 0f38b87 | 2008-06-10 18:31:01 -0400 | [diff] [blame] | 153 | dest->data = kmemdup(p, len, GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | if (unlikely(dest->data == NULL)) |
| 155 | return ERR_PTR(-ENOMEM); |
| 156 | dest->len = len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | return q; |
| 158 | } |
| 159 | |
| 160 | static struct gss_cl_ctx * |
| 161 | gss_cred_get_ctx(struct rpc_cred *cred) |
| 162 | { |
| 163 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); |
| 164 | struct gss_cl_ctx *ctx = NULL; |
| 165 | |
Trond Myklebust | 5d28dc8 | 2007-06-26 19:18:38 -0400 | [diff] [blame] | 166 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | if (gss_cred->gc_ctx) |
| 168 | ctx = gss_get_ctx(gss_cred->gc_ctx); |
Trond Myklebust | 5d28dc8 | 2007-06-26 19:18:38 -0400 | [diff] [blame] | 169 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | return ctx; |
| 171 | } |
| 172 | |
| 173 | static struct gss_cl_ctx * |
| 174 | gss_alloc_context(void) |
| 175 | { |
| 176 | struct gss_cl_ctx *ctx; |
| 177 | |
Trond Myklebust | 0f38b87 | 2008-06-10 18:31:01 -0400 | [diff] [blame] | 178 | ctx = kzalloc(sizeof(*ctx), GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | if (ctx != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | ctx->gc_proc = RPC_GSS_PROC_DATA; |
| 181 | ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */ |
| 182 | spin_lock_init(&ctx->gc_seq_lock); |
| 183 | atomic_set(&ctx->count,1); |
| 184 | } |
| 185 | return ctx; |
| 186 | } |
| 187 | |
| 188 | #define GSSD_MIN_TIMEOUT (60 * 60) |
| 189 | static const void * |
| 190 | gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm) |
| 191 | { |
| 192 | const void *q; |
| 193 | unsigned int seclen; |
| 194 | unsigned int timeout; |
| 195 | u32 window_size; |
| 196 | int ret; |
| 197 | |
| 198 | /* First unsigned int gives the lifetime (in seconds) of the cred */ |
| 199 | p = simple_get_bytes(p, end, &timeout, sizeof(timeout)); |
| 200 | if (IS_ERR(p)) |
| 201 | goto err; |
| 202 | if (timeout == 0) |
| 203 | timeout = GSSD_MIN_TIMEOUT; |
| 204 | ctx->gc_expiry = jiffies + (unsigned long)timeout * HZ * 3 / 4; |
| 205 | /* Sequence number window. Determines the maximum number of simultaneous requests */ |
| 206 | p = simple_get_bytes(p, end, &window_size, sizeof(window_size)); |
| 207 | if (IS_ERR(p)) |
| 208 | goto err; |
| 209 | ctx->gc_win = window_size; |
| 210 | /* gssd signals an error by passing ctx->gc_win = 0: */ |
| 211 | if (ctx->gc_win == 0) { |
Jeff Layton | dc5ddce | 2010-01-07 09:42:02 -0500 | [diff] [blame] | 212 | /* |
| 213 | * in which case, p points to an error code. Anything other |
| 214 | * than -EKEYEXPIRED gets converted to -EACCES. |
| 215 | */ |
| 216 | p = simple_get_bytes(p, end, &ret, sizeof(ret)); |
| 217 | if (!IS_ERR(p)) |
| 218 | p = (ret == -EKEYEXPIRED) ? ERR_PTR(-EKEYEXPIRED) : |
| 219 | ERR_PTR(-EACCES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | goto err; |
| 221 | } |
| 222 | /* copy the opaque wire context */ |
| 223 | p = simple_get_netobj(p, end, &ctx->gc_wire_ctx); |
| 224 | if (IS_ERR(p)) |
| 225 | goto err; |
| 226 | /* import the opaque security context */ |
| 227 | p = simple_get_bytes(p, end, &seclen, sizeof(seclen)); |
| 228 | if (IS_ERR(p)) |
| 229 | goto err; |
| 230 | q = (const void *)((const char *)p + seclen); |
| 231 | if (unlikely(q > end || q < p)) { |
| 232 | p = ERR_PTR(-EFAULT); |
| 233 | goto err; |
| 234 | } |
Trond Myklebust | 1f4c86c | 2010-05-13 12:51:02 -0400 | [diff] [blame] | 235 | ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx, GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | if (ret < 0) { |
| 237 | p = ERR_PTR(ret); |
| 238 | goto err; |
| 239 | } |
| 240 | return q; |
| 241 | err: |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 242 | dprintk("RPC: gss_fill_context returning %ld\n", -PTR_ERR(p)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | return p; |
| 244 | } |
| 245 | |
\"J. Bruce Fields\ | 34769fc | 2008-12-23 16:16:37 -0500 | [diff] [blame] | 246 | #define UPCALL_BUF_LEN 128 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | |
| 248 | struct gss_upcall_msg { |
| 249 | atomic_t count; |
| 250 | uid_t uid; |
| 251 | struct rpc_pipe_msg msg; |
| 252 | struct list_head list; |
| 253 | struct gss_auth *auth; |
Stanislav Kinsbursky | 9beae46 | 2011-12-26 15:43:57 +0300 | [diff] [blame^] | 254 | struct rpc_pipe *pipe; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | struct rpc_wait_queue rpc_waitqueue; |
| 256 | wait_queue_head_t waitqueue; |
| 257 | struct gss_cl_ctx *ctx; |
\"J. Bruce Fields\ | 34769fc | 2008-12-23 16:16:37 -0500 | [diff] [blame] | 258 | char databuf[UPCALL_BUF_LEN]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | }; |
| 260 | |
\"J. Bruce Fields\ | 79a3f20 | 2008-12-23 16:10:52 -0500 | [diff] [blame] | 261 | static int get_pipe_version(void) |
| 262 | { |
| 263 | int ret; |
| 264 | |
| 265 | spin_lock(&pipe_version_lock); |
| 266 | if (pipe_version >= 0) { |
| 267 | atomic_inc(&pipe_users); |
\"J. Bruce Fields\ | 34769fc | 2008-12-23 16:16:37 -0500 | [diff] [blame] | 268 | ret = pipe_version; |
\"J. Bruce Fields\ | 79a3f20 | 2008-12-23 16:10:52 -0500 | [diff] [blame] | 269 | } else |
| 270 | ret = -EAGAIN; |
| 271 | spin_unlock(&pipe_version_lock); |
| 272 | return ret; |
| 273 | } |
| 274 | |
| 275 | static void put_pipe_version(void) |
| 276 | { |
| 277 | if (atomic_dec_and_lock(&pipe_users, &pipe_version_lock)) { |
| 278 | pipe_version = -1; |
| 279 | spin_unlock(&pipe_version_lock); |
| 280 | } |
| 281 | } |
| 282 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | static void |
| 284 | gss_release_msg(struct gss_upcall_msg *gss_msg) |
| 285 | { |
| 286 | if (!atomic_dec_and_test(&gss_msg->count)) |
| 287 | return; |
\"J. Bruce Fields\ | 79a3f20 | 2008-12-23 16:10:52 -0500 | [diff] [blame] | 288 | put_pipe_version(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | BUG_ON(!list_empty(&gss_msg->list)); |
| 290 | if (gss_msg->ctx != NULL) |
| 291 | gss_put_ctx(gss_msg->ctx); |
Trond Myklebust | f6a1cc8 | 2008-02-22 17:06:55 -0500 | [diff] [blame] | 292 | rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | kfree(gss_msg); |
| 294 | } |
| 295 | |
| 296 | static struct gss_upcall_msg * |
Stanislav Kinsbursky | 9beae46 | 2011-12-26 15:43:57 +0300 | [diff] [blame^] | 297 | __gss_find_upcall(struct rpc_pipe *pipe, uid_t uid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | { |
| 299 | struct gss_upcall_msg *pos; |
Stanislav Kinsbursky | 9beae46 | 2011-12-26 15:43:57 +0300 | [diff] [blame^] | 300 | list_for_each_entry(pos, &pipe->in_downcall, list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | if (pos->uid != uid) |
| 302 | continue; |
| 303 | atomic_inc(&pos->count); |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 304 | dprintk("RPC: gss_find_upcall found msg %p\n", pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | return pos; |
| 306 | } |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 307 | dprintk("RPC: gss_find_upcall found nothing\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | return NULL; |
| 309 | } |
| 310 | |
\\\"J. Bruce Fields\\\ | 720b8f2 | 2008-06-09 16:51:33 -0400 | [diff] [blame] | 311 | /* Try to add an upcall to the pipefs queue. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | * If an upcall owned by our uid already exists, then we return a reference |
| 313 | * to that upcall instead of adding the new upcall. |
| 314 | */ |
| 315 | static inline struct gss_upcall_msg * |
Suresh Jayaraman | 053e324 | 2009-12-09 23:15:22 +0530 | [diff] [blame] | 316 | gss_add_msg(struct gss_upcall_msg *gss_msg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | { |
Stanislav Kinsbursky | 9beae46 | 2011-12-26 15:43:57 +0300 | [diff] [blame^] | 318 | struct rpc_pipe *pipe = gss_msg->pipe; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | struct gss_upcall_msg *old; |
| 320 | |
Stanislav Kinsbursky | 9beae46 | 2011-12-26 15:43:57 +0300 | [diff] [blame^] | 321 | spin_lock(&pipe->lock); |
| 322 | old = __gss_find_upcall(pipe, gss_msg->uid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | if (old == NULL) { |
| 324 | atomic_inc(&gss_msg->count); |
Stanislav Kinsbursky | 9beae46 | 2011-12-26 15:43:57 +0300 | [diff] [blame^] | 325 | list_add(&gss_msg->list, &pipe->in_downcall); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | } else |
| 327 | gss_msg = old; |
Stanislav Kinsbursky | 9beae46 | 2011-12-26 15:43:57 +0300 | [diff] [blame^] | 328 | spin_unlock(&pipe->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | return gss_msg; |
| 330 | } |
| 331 | |
| 332 | static void |
| 333 | __gss_unhash_msg(struct gss_upcall_msg *gss_msg) |
| 334 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | list_del_init(&gss_msg->list); |
| 336 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); |
| 337 | wake_up_all(&gss_msg->waitqueue); |
| 338 | atomic_dec(&gss_msg->count); |
| 339 | } |
| 340 | |
| 341 | static void |
| 342 | gss_unhash_msg(struct gss_upcall_msg *gss_msg) |
| 343 | { |
Stanislav Kinsbursky | 9beae46 | 2011-12-26 15:43:57 +0300 | [diff] [blame^] | 344 | struct rpc_pipe *pipe = gss_msg->pipe; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | |
Trond Myklebust | 3b68aae | 2007-06-07 10:14:15 -0400 | [diff] [blame] | 346 | if (list_empty(&gss_msg->list)) |
| 347 | return; |
Stanislav Kinsbursky | 9beae46 | 2011-12-26 15:43:57 +0300 | [diff] [blame^] | 348 | spin_lock(&pipe->lock); |
Trond Myklebust | 3b68aae | 2007-06-07 10:14:15 -0400 | [diff] [blame] | 349 | if (!list_empty(&gss_msg->list)) |
| 350 | __gss_unhash_msg(gss_msg); |
Stanislav Kinsbursky | 9beae46 | 2011-12-26 15:43:57 +0300 | [diff] [blame^] | 351 | spin_unlock(&pipe->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | } |
| 353 | |
| 354 | static void |
Trond Myklebust | 126e216 | 2010-05-13 12:55:38 -0400 | [diff] [blame] | 355 | gss_handle_downcall_result(struct gss_cred *gss_cred, struct gss_upcall_msg *gss_msg) |
| 356 | { |
| 357 | switch (gss_msg->msg.errno) { |
| 358 | case 0: |
| 359 | if (gss_msg->ctx == NULL) |
| 360 | break; |
| 361 | clear_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags); |
| 362 | gss_cred_set_ctx(&gss_cred->gc_base, gss_msg->ctx); |
| 363 | break; |
| 364 | case -EKEYEXPIRED: |
| 365 | set_bit(RPCAUTH_CRED_NEGATIVE, &gss_cred->gc_base.cr_flags); |
| 366 | } |
| 367 | gss_cred->gc_upcall_timestamp = jiffies; |
| 368 | gss_cred->gc_upcall = NULL; |
| 369 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); |
| 370 | } |
| 371 | |
| 372 | static void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | gss_upcall_callback(struct rpc_task *task) |
| 374 | { |
Trond Myklebust | a17c215 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 375 | struct gss_cred *gss_cred = container_of(task->tk_rqstp->rq_cred, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | struct gss_cred, gc_base); |
| 377 | struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; |
Stanislav Kinsbursky | 9beae46 | 2011-12-26 15:43:57 +0300 | [diff] [blame^] | 378 | struct rpc_pipe *pipe = gss_msg->pipe; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | |
Stanislav Kinsbursky | 9beae46 | 2011-12-26 15:43:57 +0300 | [diff] [blame^] | 380 | spin_lock(&pipe->lock); |
Trond Myklebust | 126e216 | 2010-05-13 12:55:38 -0400 | [diff] [blame] | 381 | gss_handle_downcall_result(gss_cred, gss_msg); |
Stanislav Kinsbursky | 9beae46 | 2011-12-26 15:43:57 +0300 | [diff] [blame^] | 382 | spin_unlock(&pipe->lock); |
Trond Myklebust | 126e216 | 2010-05-13 12:55:38 -0400 | [diff] [blame] | 383 | task->tk_status = gss_msg->msg.errno; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | gss_release_msg(gss_msg); |
| 385 | } |
| 386 | |
\"J. Bruce Fields\ | 34769fc | 2008-12-23 16:16:37 -0500 | [diff] [blame] | 387 | static void gss_encode_v0_msg(struct gss_upcall_msg *gss_msg) |
| 388 | { |
| 389 | gss_msg->msg.data = &gss_msg->uid; |
| 390 | gss_msg->msg.len = sizeof(gss_msg->uid); |
| 391 | } |
| 392 | |
Olga Kornievskaia | 8b1c7bf | 2008-12-23 16:19:26 -0500 | [diff] [blame] | 393 | static void gss_encode_v1_msg(struct gss_upcall_msg *gss_msg, |
Trond Myklebust | 68c9715 | 2012-01-03 13:22:46 -0500 | [diff] [blame] | 394 | struct rpc_clnt *clnt, |
| 395 | const char *service_name) |
\"J. Bruce Fields\ | 34769fc | 2008-12-23 16:16:37 -0500 | [diff] [blame] | 396 | { |
Trond Myklebust | 683ac66 | 2010-04-08 14:09:58 -0400 | [diff] [blame] | 397 | struct gss_api_mech *mech = gss_msg->auth->mech; |
Olga Kornievskaia | 8b1c7bf | 2008-12-23 16:19:26 -0500 | [diff] [blame] | 398 | char *p = gss_msg->databuf; |
| 399 | int len = 0; |
| 400 | |
| 401 | gss_msg->msg.len = sprintf(gss_msg->databuf, "mech=%s uid=%d ", |
Trond Myklebust | 683ac66 | 2010-04-08 14:09:58 -0400 | [diff] [blame] | 402 | mech->gm_name, |
\"J. Bruce Fields\ | 34769fc | 2008-12-23 16:16:37 -0500 | [diff] [blame] | 403 | gss_msg->uid); |
Olga Kornievskaia | 8b1c7bf | 2008-12-23 16:19:26 -0500 | [diff] [blame] | 404 | p += gss_msg->msg.len; |
| 405 | if (clnt->cl_principal) { |
| 406 | len = sprintf(p, "target=%s ", clnt->cl_principal); |
| 407 | p += len; |
| 408 | gss_msg->msg.len += len; |
| 409 | } |
Trond Myklebust | 68c9715 | 2012-01-03 13:22:46 -0500 | [diff] [blame] | 410 | if (service_name != NULL) { |
| 411 | len = sprintf(p, "service=%s ", service_name); |
Olga Kornievskaia | 2efef70 | 2008-12-23 16:19:56 -0500 | [diff] [blame] | 412 | p += len; |
| 413 | gss_msg->msg.len += len; |
| 414 | } |
Trond Myklebust | 683ac66 | 2010-04-08 14:09:58 -0400 | [diff] [blame] | 415 | if (mech->gm_upcall_enctypes) { |
Kevin Coffman | f862822 | 2011-03-03 00:51:41 +0000 | [diff] [blame] | 416 | len = sprintf(p, "enctypes=%s ", mech->gm_upcall_enctypes); |
Trond Myklebust | 683ac66 | 2010-04-08 14:09:58 -0400 | [diff] [blame] | 417 | p += len; |
| 418 | gss_msg->msg.len += len; |
| 419 | } |
Olga Kornievskaia | 8b1c7bf | 2008-12-23 16:19:26 -0500 | [diff] [blame] | 420 | len = sprintf(p, "\n"); |
| 421 | gss_msg->msg.len += len; |
| 422 | |
\"J. Bruce Fields\ | 34769fc | 2008-12-23 16:16:37 -0500 | [diff] [blame] | 423 | gss_msg->msg.data = gss_msg->databuf; |
| 424 | BUG_ON(gss_msg->msg.len > UPCALL_BUF_LEN); |
| 425 | } |
| 426 | |
Olga Kornievskaia | 8b1c7bf | 2008-12-23 16:19:26 -0500 | [diff] [blame] | 427 | static void gss_encode_msg(struct gss_upcall_msg *gss_msg, |
Trond Myklebust | 68c9715 | 2012-01-03 13:22:46 -0500 | [diff] [blame] | 428 | struct rpc_clnt *clnt, |
| 429 | const char *service_name) |
\"J. Bruce Fields\ | 34769fc | 2008-12-23 16:16:37 -0500 | [diff] [blame] | 430 | { |
| 431 | if (pipe_version == 0) |
| 432 | gss_encode_v0_msg(gss_msg); |
| 433 | else /* pipe_version == 1 */ |
Trond Myklebust | 68c9715 | 2012-01-03 13:22:46 -0500 | [diff] [blame] | 434 | gss_encode_v1_msg(gss_msg, clnt, service_name); |
\"J. Bruce Fields\ | 34769fc | 2008-12-23 16:16:37 -0500 | [diff] [blame] | 435 | } |
| 436 | |
Trond Myklebust | 68c9715 | 2012-01-03 13:22:46 -0500 | [diff] [blame] | 437 | static struct gss_upcall_msg * |
| 438 | gss_alloc_msg(struct gss_auth *gss_auth, struct rpc_clnt *clnt, |
| 439 | uid_t uid, const char *service_name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | { |
| 441 | struct gss_upcall_msg *gss_msg; |
\"J. Bruce Fields\ | 79a3f20 | 2008-12-23 16:10:52 -0500 | [diff] [blame] | 442 | int vers; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | |
Trond Myklebust | 0f38b87 | 2008-06-10 18:31:01 -0400 | [diff] [blame] | 444 | gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS); |
\"J. Bruce Fields\ | db75b3d | 2008-12-23 16:07:13 -0500 | [diff] [blame] | 445 | if (gss_msg == NULL) |
| 446 | return ERR_PTR(-ENOMEM); |
\"J. Bruce Fields\ | 79a3f20 | 2008-12-23 16:10:52 -0500 | [diff] [blame] | 447 | vers = get_pipe_version(); |
| 448 | if (vers < 0) { |
| 449 | kfree(gss_msg); |
| 450 | return ERR_PTR(vers); |
| 451 | } |
Stanislav Kinsbursky | 9beae46 | 2011-12-26 15:43:57 +0300 | [diff] [blame^] | 452 | gss_msg->pipe = RPC_I(gss_auth->dentry[vers]->d_inode)->pipe; |
\"J. Bruce Fields\ | db75b3d | 2008-12-23 16:07:13 -0500 | [diff] [blame] | 453 | INIT_LIST_HEAD(&gss_msg->list); |
| 454 | rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); |
| 455 | init_waitqueue_head(&gss_msg->waitqueue); |
| 456 | atomic_set(&gss_msg->count, 1); |
\"J. Bruce Fields\ | db75b3d | 2008-12-23 16:07:13 -0500 | [diff] [blame] | 457 | gss_msg->uid = uid; |
| 458 | gss_msg->auth = gss_auth; |
Trond Myklebust | 68c9715 | 2012-01-03 13:22:46 -0500 | [diff] [blame] | 459 | gss_encode_msg(gss_msg, clnt, service_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | return gss_msg; |
| 461 | } |
| 462 | |
| 463 | static struct gss_upcall_msg * |
| 464 | gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred) |
| 465 | { |
Trond Myklebust | 7c67db3 | 2008-04-07 20:50:11 -0400 | [diff] [blame] | 466 | struct gss_cred *gss_cred = container_of(cred, |
| 467 | struct gss_cred, gc_base); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | struct gss_upcall_msg *gss_new, *gss_msg; |
Trond Myklebust | 7c67db3 | 2008-04-07 20:50:11 -0400 | [diff] [blame] | 469 | uid_t uid = cred->cr_uid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | |
Trond Myklebust | 68c9715 | 2012-01-03 13:22:46 -0500 | [diff] [blame] | 471 | gss_new = gss_alloc_msg(gss_auth, clnt, uid, gss_cred->gc_principal); |
\"J. Bruce Fields\ | db75b3d | 2008-12-23 16:07:13 -0500 | [diff] [blame] | 472 | if (IS_ERR(gss_new)) |
| 473 | return gss_new; |
Suresh Jayaraman | 053e324 | 2009-12-09 23:15:22 +0530 | [diff] [blame] | 474 | gss_msg = gss_add_msg(gss_new); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | if (gss_msg == gss_new) { |
Stanislav Kinsbursky | 9beae46 | 2011-12-26 15:43:57 +0300 | [diff] [blame^] | 476 | int res = rpc_queue_upcall(gss_new->pipe, &gss_new->msg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | if (res) { |
| 478 | gss_unhash_msg(gss_new); |
| 479 | gss_msg = ERR_PTR(res); |
| 480 | } |
| 481 | } else |
| 482 | gss_release_msg(gss_new); |
| 483 | return gss_msg; |
| 484 | } |
| 485 | |
\"J. Bruce Fields\ | b03568c | 2008-12-23 16:06:55 -0500 | [diff] [blame] | 486 | static void warn_gssd(void) |
| 487 | { |
| 488 | static unsigned long ratelimit; |
| 489 | unsigned long now = jiffies; |
| 490 | |
| 491 | if (time_after(now, ratelimit)) { |
| 492 | printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n" |
| 493 | "Please check user daemon is running.\n"); |
| 494 | ratelimit = now + 15*HZ; |
| 495 | } |
| 496 | } |
| 497 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | static inline int |
| 499 | gss_refresh_upcall(struct rpc_task *task) |
| 500 | { |
Trond Myklebust | a17c215 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 501 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
Trond Myklebust | 4a8c134 | 2007-06-07 10:14:14 -0400 | [diff] [blame] | 502 | struct gss_auth *gss_auth = container_of(cred->cr_auth, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | struct gss_auth, rpc_auth); |
| 504 | struct gss_cred *gss_cred = container_of(cred, |
| 505 | struct gss_cred, gc_base); |
| 506 | struct gss_upcall_msg *gss_msg; |
Stanislav Kinsbursky | 9beae46 | 2011-12-26 15:43:57 +0300 | [diff] [blame^] | 507 | struct rpc_pipe *pipe; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | int err = 0; |
| 509 | |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 510 | dprintk("RPC: %5u gss_refresh_upcall for uid %u\n", task->tk_pid, |
| 511 | cred->cr_uid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred); |
Roel Kluin | 480e324 | 2009-12-08 13:13:03 -0500 | [diff] [blame] | 513 | if (PTR_ERR(gss_msg) == -EAGAIN) { |
\"J. Bruce Fields\ | 79a3f20 | 2008-12-23 16:10:52 -0500 | [diff] [blame] | 514 | /* XXX: warning on the first, under the assumption we |
| 515 | * shouldn't normally hit this case on a refresh. */ |
| 516 | warn_gssd(); |
| 517 | task->tk_timeout = 15*HZ; |
| 518 | rpc_sleep_on(&pipe_version_rpc_waitqueue, task, NULL); |
Bryan Schumaker | d1a8016 | 2011-04-13 14:31:28 -0400 | [diff] [blame] | 519 | return -EAGAIN; |
\"J. Bruce Fields\ | 79a3f20 | 2008-12-23 16:10:52 -0500 | [diff] [blame] | 520 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | if (IS_ERR(gss_msg)) { |
| 522 | err = PTR_ERR(gss_msg); |
| 523 | goto out; |
| 524 | } |
Stanislav Kinsbursky | 9beae46 | 2011-12-26 15:43:57 +0300 | [diff] [blame^] | 525 | pipe = gss_msg->pipe; |
| 526 | spin_lock(&pipe->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | if (gss_cred->gc_upcall != NULL) |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 528 | rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL); |
Trond Myklebust | 126e216 | 2010-05-13 12:55:38 -0400 | [diff] [blame] | 529 | else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | task->tk_timeout = 0; |
| 531 | gss_cred->gc_upcall = gss_msg; |
| 532 | /* gss_upcall_callback will release the reference to gss_upcall_msg */ |
| 533 | atomic_inc(&gss_msg->count); |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 534 | rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback); |
Trond Myklebust | 126e216 | 2010-05-13 12:55:38 -0400 | [diff] [blame] | 535 | } else { |
| 536 | gss_handle_downcall_result(gss_cred, gss_msg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | err = gss_msg->msg.errno; |
Trond Myklebust | 126e216 | 2010-05-13 12:55:38 -0400 | [diff] [blame] | 538 | } |
Stanislav Kinsbursky | 9beae46 | 2011-12-26 15:43:57 +0300 | [diff] [blame^] | 539 | spin_unlock(&pipe->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | gss_release_msg(gss_msg); |
| 541 | out: |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 542 | dprintk("RPC: %5u gss_refresh_upcall for uid %u result %d\n", |
| 543 | task->tk_pid, cred->cr_uid, err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | return err; |
| 545 | } |
| 546 | |
| 547 | static inline int |
| 548 | gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) |
| 549 | { |
Stanislav Kinsbursky | 9beae46 | 2011-12-26 15:43:57 +0300 | [diff] [blame^] | 550 | struct rpc_pipe *pipe; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | struct rpc_cred *cred = &gss_cred->gc_base; |
| 552 | struct gss_upcall_msg *gss_msg; |
| 553 | DEFINE_WAIT(wait); |
| 554 | int err = 0; |
| 555 | |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 556 | dprintk("RPC: gss_upcall for uid %u\n", cred->cr_uid); |
\"J. Bruce Fields\ | 79a3f20 | 2008-12-23 16:10:52 -0500 | [diff] [blame] | 557 | retry: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred); |
\"J. Bruce Fields\ | 79a3f20 | 2008-12-23 16:10:52 -0500 | [diff] [blame] | 559 | if (PTR_ERR(gss_msg) == -EAGAIN) { |
| 560 | err = wait_event_interruptible_timeout(pipe_version_waitqueue, |
| 561 | pipe_version >= 0, 15*HZ); |
Bryan Schumaker | d1a8016 | 2011-04-13 14:31:28 -0400 | [diff] [blame] | 562 | if (pipe_version < 0) { |
| 563 | warn_gssd(); |
| 564 | err = -EACCES; |
| 565 | } |
\"J. Bruce Fields\ | 79a3f20 | 2008-12-23 16:10:52 -0500 | [diff] [blame] | 566 | if (err) |
| 567 | goto out; |
\"J. Bruce Fields\ | 79a3f20 | 2008-12-23 16:10:52 -0500 | [diff] [blame] | 568 | goto retry; |
| 569 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | if (IS_ERR(gss_msg)) { |
| 571 | err = PTR_ERR(gss_msg); |
| 572 | goto out; |
| 573 | } |
Stanislav Kinsbursky | 9beae46 | 2011-12-26 15:43:57 +0300 | [diff] [blame^] | 574 | pipe = gss_msg->pipe; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | for (;;) { |
Trond Myklebust | 5afa9133 | 2011-06-17 10:14:59 -0400 | [diff] [blame] | 576 | prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_KILLABLE); |
Stanislav Kinsbursky | 9beae46 | 2011-12-26 15:43:57 +0300 | [diff] [blame^] | 577 | spin_lock(&pipe->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | break; |
| 580 | } |
Stanislav Kinsbursky | 9beae46 | 2011-12-26 15:43:57 +0300 | [diff] [blame^] | 581 | spin_unlock(&pipe->lock); |
Trond Myklebust | 5afa9133 | 2011-06-17 10:14:59 -0400 | [diff] [blame] | 582 | if (fatal_signal_pending(current)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | err = -ERESTARTSYS; |
| 584 | goto out_intr; |
| 585 | } |
| 586 | schedule(); |
| 587 | } |
| 588 | if (gss_msg->ctx) |
Trond Myklebust | 7b6962b | 2008-04-17 16:53:01 -0400 | [diff] [blame] | 589 | gss_cred_set_ctx(cred, gss_msg->ctx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | else |
| 591 | err = gss_msg->msg.errno; |
Stanislav Kinsbursky | 9beae46 | 2011-12-26 15:43:57 +0300 | [diff] [blame^] | 592 | spin_unlock(&pipe->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | out_intr: |
| 594 | finish_wait(&gss_msg->waitqueue, &wait); |
| 595 | gss_release_msg(gss_msg); |
| 596 | out: |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 597 | dprintk("RPC: gss_create_upcall for uid %u result %d\n", |
| 598 | cred->cr_uid, err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | return err; |
| 600 | } |
| 601 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | #define MSG_BUF_MAXSIZE 1024 |
| 603 | |
| 604 | static ssize_t |
| 605 | gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) |
| 606 | { |
| 607 | const void *p, *end; |
| 608 | void *buf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | struct gss_upcall_msg *gss_msg; |
Stanislav Kinsbursky | 9beae46 | 2011-12-26 15:43:57 +0300 | [diff] [blame^] | 610 | struct rpc_pipe *pipe = RPC_I(filp->f_dentry->d_inode)->pipe; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | struct gss_cl_ctx *ctx; |
| 612 | uid_t uid; |
Trond Myklebust | 3b68aae | 2007-06-07 10:14:15 -0400 | [diff] [blame] | 613 | ssize_t err = -EFBIG; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | |
| 615 | if (mlen > MSG_BUF_MAXSIZE) |
| 616 | goto out; |
| 617 | err = -ENOMEM; |
Trond Myklebust | 0f38b87 | 2008-06-10 18:31:01 -0400 | [diff] [blame] | 618 | buf = kmalloc(mlen, GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | if (!buf) |
| 620 | goto out; |
| 621 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | err = -EFAULT; |
| 623 | if (copy_from_user(buf, src, mlen)) |
| 624 | goto err; |
| 625 | |
| 626 | end = (const void *)((char *)buf + mlen); |
| 627 | p = simple_get_bytes(buf, end, &uid, sizeof(uid)); |
| 628 | if (IS_ERR(p)) { |
| 629 | err = PTR_ERR(p); |
| 630 | goto err; |
| 631 | } |
| 632 | |
| 633 | err = -ENOMEM; |
| 634 | ctx = gss_alloc_context(); |
| 635 | if (ctx == NULL) |
| 636 | goto err; |
Trond Myklebust | 3b68aae | 2007-06-07 10:14:15 -0400 | [diff] [blame] | 637 | |
| 638 | err = -ENOENT; |
| 639 | /* Find a matching upcall */ |
Stanislav Kinsbursky | 9beae46 | 2011-12-26 15:43:57 +0300 | [diff] [blame^] | 640 | spin_lock(&pipe->lock); |
| 641 | gss_msg = __gss_find_upcall(pipe, uid); |
Trond Myklebust | 3b68aae | 2007-06-07 10:14:15 -0400 | [diff] [blame] | 642 | if (gss_msg == NULL) { |
Stanislav Kinsbursky | 9beae46 | 2011-12-26 15:43:57 +0300 | [diff] [blame^] | 643 | spin_unlock(&pipe->lock); |
Trond Myklebust | 3b68aae | 2007-06-07 10:14:15 -0400 | [diff] [blame] | 644 | goto err_put_ctx; |
| 645 | } |
| 646 | list_del_init(&gss_msg->list); |
Stanislav Kinsbursky | 9beae46 | 2011-12-26 15:43:57 +0300 | [diff] [blame^] | 647 | spin_unlock(&pipe->lock); |
Trond Myklebust | 3b68aae | 2007-06-07 10:14:15 -0400 | [diff] [blame] | 648 | |
Trond Myklebust | 6e84c7b | 2007-06-07 15:31:36 -0400 | [diff] [blame] | 649 | p = gss_fill_context(p, end, ctx, gss_msg->auth->mech); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | if (IS_ERR(p)) { |
| 651 | err = PTR_ERR(p); |
Jeff Layton | 486bad2 | 2009-12-18 16:28:20 -0500 | [diff] [blame] | 652 | switch (err) { |
| 653 | case -EACCES: |
Jeff Layton | dc5ddce | 2010-01-07 09:42:02 -0500 | [diff] [blame] | 654 | case -EKEYEXPIRED: |
Jeff Layton | 486bad2 | 2009-12-18 16:28:20 -0500 | [diff] [blame] | 655 | gss_msg->msg.errno = err; |
| 656 | err = mlen; |
| 657 | break; |
| 658 | case -EFAULT: |
| 659 | case -ENOMEM: |
| 660 | case -EINVAL: |
| 661 | case -ENOSYS: |
| 662 | gss_msg->msg.errno = -EAGAIN; |
| 663 | break; |
| 664 | default: |
| 665 | printk(KERN_CRIT "%s: bad return from " |
Randy Dunlap | 6c85309 | 2010-01-06 17:26:27 -0500 | [diff] [blame] | 666 | "gss_fill_context: %zd\n", __func__, err); |
Jeff Layton | 486bad2 | 2009-12-18 16:28:20 -0500 | [diff] [blame] | 667 | BUG(); |
| 668 | } |
Trond Myklebust | 3b68aae | 2007-06-07 10:14:15 -0400 | [diff] [blame] | 669 | goto err_release_msg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | } |
Trond Myklebust | 3b68aae | 2007-06-07 10:14:15 -0400 | [diff] [blame] | 671 | gss_msg->ctx = gss_get_ctx(ctx); |
| 672 | err = mlen; |
| 673 | |
| 674 | err_release_msg: |
Stanislav Kinsbursky | 9beae46 | 2011-12-26 15:43:57 +0300 | [diff] [blame^] | 675 | spin_lock(&pipe->lock); |
Trond Myklebust | 3b68aae | 2007-06-07 10:14:15 -0400 | [diff] [blame] | 676 | __gss_unhash_msg(gss_msg); |
Stanislav Kinsbursky | 9beae46 | 2011-12-26 15:43:57 +0300 | [diff] [blame^] | 677 | spin_unlock(&pipe->lock); |
Trond Myklebust | 3b68aae | 2007-06-07 10:14:15 -0400 | [diff] [blame] | 678 | gss_release_msg(gss_msg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | err_put_ctx: |
| 680 | gss_put_ctx(ctx); |
| 681 | err: |
| 682 | kfree(buf); |
| 683 | out: |
Trond Myklebust | 3b68aae | 2007-06-07 10:14:15 -0400 | [diff] [blame] | 684 | dprintk("RPC: gss_pipe_downcall returning %Zd\n", err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | return err; |
| 686 | } |
| 687 | |
\"J. Bruce Fields\ | 34769fc | 2008-12-23 16:16:37 -0500 | [diff] [blame] | 688 | static int gss_pipe_open(struct inode *inode, int new_version) |
\"J. Bruce Fields\ | cf81939 | 2008-12-23 16:10:19 -0500 | [diff] [blame] | 689 | { |
\"J. Bruce Fields\ | 34769fc | 2008-12-23 16:16:37 -0500 | [diff] [blame] | 690 | int ret = 0; |
| 691 | |
\"J. Bruce Fields\ | 79a3f20 | 2008-12-23 16:10:52 -0500 | [diff] [blame] | 692 | spin_lock(&pipe_version_lock); |
| 693 | if (pipe_version < 0) { |
\"J. Bruce Fields\ | 34769fc | 2008-12-23 16:16:37 -0500 | [diff] [blame] | 694 | /* First open of any gss pipe determines the version: */ |
| 695 | pipe_version = new_version; |
\"J. Bruce Fields\ | 79a3f20 | 2008-12-23 16:10:52 -0500 | [diff] [blame] | 696 | rpc_wake_up(&pipe_version_rpc_waitqueue); |
| 697 | wake_up(&pipe_version_waitqueue); |
\"J. Bruce Fields\ | 34769fc | 2008-12-23 16:16:37 -0500 | [diff] [blame] | 698 | } else if (pipe_version != new_version) { |
| 699 | /* Trying to open a pipe of a different version */ |
| 700 | ret = -EBUSY; |
| 701 | goto out; |
\"J. Bruce Fields\ | 79a3f20 | 2008-12-23 16:10:52 -0500 | [diff] [blame] | 702 | } |
\"J. Bruce Fields\ | cf81939 | 2008-12-23 16:10:19 -0500 | [diff] [blame] | 703 | atomic_inc(&pipe_users); |
\"J. Bruce Fields\ | 34769fc | 2008-12-23 16:16:37 -0500 | [diff] [blame] | 704 | out: |
\"J. Bruce Fields\ | 79a3f20 | 2008-12-23 16:10:52 -0500 | [diff] [blame] | 705 | spin_unlock(&pipe_version_lock); |
\"J. Bruce Fields\ | 34769fc | 2008-12-23 16:16:37 -0500 | [diff] [blame] | 706 | return ret; |
| 707 | |
| 708 | } |
| 709 | |
| 710 | static int gss_pipe_open_v0(struct inode *inode) |
| 711 | { |
| 712 | return gss_pipe_open(inode, 0); |
| 713 | } |
| 714 | |
| 715 | static int gss_pipe_open_v1(struct inode *inode) |
| 716 | { |
| 717 | return gss_pipe_open(inode, 1); |
\"J. Bruce Fields\ | cf81939 | 2008-12-23 16:10:19 -0500 | [diff] [blame] | 718 | } |
| 719 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | static void |
| 721 | gss_pipe_release(struct inode *inode) |
| 722 | { |
Stanislav Kinsbursky | 9beae46 | 2011-12-26 15:43:57 +0300 | [diff] [blame^] | 723 | struct rpc_pipe *pipe = RPC_I(inode)->pipe; |
Trond Myklebust | 6e84c7b | 2007-06-07 15:31:36 -0400 | [diff] [blame] | 724 | struct gss_upcall_msg *gss_msg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | |
Trond Myklebust | 5a67657 | 2010-09-12 19:55:25 -0400 | [diff] [blame] | 726 | restart: |
Stanislav Kinsbursky | 9beae46 | 2011-12-26 15:43:57 +0300 | [diff] [blame^] | 727 | spin_lock(&pipe->lock); |
| 728 | list_for_each_entry(gss_msg, &pipe->in_downcall, list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | |
Trond Myklebust | 5a67657 | 2010-09-12 19:55:25 -0400 | [diff] [blame] | 730 | if (!list_empty(&gss_msg->msg.list)) |
| 731 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | gss_msg->msg.errno = -EPIPE; |
| 733 | atomic_inc(&gss_msg->count); |
| 734 | __gss_unhash_msg(gss_msg); |
Stanislav Kinsbursky | 9beae46 | 2011-12-26 15:43:57 +0300 | [diff] [blame^] | 735 | spin_unlock(&pipe->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | gss_release_msg(gss_msg); |
Trond Myklebust | 5a67657 | 2010-09-12 19:55:25 -0400 | [diff] [blame] | 737 | goto restart; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | } |
Stanislav Kinsbursky | 9beae46 | 2011-12-26 15:43:57 +0300 | [diff] [blame^] | 739 | spin_unlock(&pipe->lock); |
\"J. Bruce Fields\ | cf81939 | 2008-12-23 16:10:19 -0500 | [diff] [blame] | 740 | |
\"J. Bruce Fields\ | 79a3f20 | 2008-12-23 16:10:52 -0500 | [diff] [blame] | 741 | put_pipe_version(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | } |
| 743 | |
| 744 | static void |
| 745 | gss_pipe_destroy_msg(struct rpc_pipe_msg *msg) |
| 746 | { |
| 747 | struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | |
| 749 | if (msg->errno < 0) { |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 750 | dprintk("RPC: gss_pipe_destroy_msg releasing msg %p\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | gss_msg); |
| 752 | atomic_inc(&gss_msg->count); |
| 753 | gss_unhash_msg(gss_msg); |
\"J. Bruce Fields\ | b03568c | 2008-12-23 16:06:55 -0500 | [diff] [blame] | 754 | if (msg->errno == -ETIMEDOUT) |
| 755 | warn_gssd(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | gss_release_msg(gss_msg); |
| 757 | } |
| 758 | } |
| 759 | |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 760 | /* |
| 761 | * NOTE: we have the opportunity to use different |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | * parameters based on the input flavor (which must be a pseudoflavor) |
| 763 | */ |
| 764 | static struct rpc_auth * |
| 765 | gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor) |
| 766 | { |
| 767 | struct gss_auth *gss_auth; |
| 768 | struct rpc_auth * auth; |
J. Bruce Fields | 6a19275 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 769 | int err = -ENOMEM; /* XXX? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 771 | dprintk("RPC: creating GSS authenticator for client %p\n", clnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | |
| 773 | if (!try_module_get(THIS_MODULE)) |
J. Bruce Fields | 6a19275 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 774 | return ERR_PTR(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL))) |
| 776 | goto out_dec; |
| 777 | gss_auth->client = clnt; |
J. Bruce Fields | 6a19275 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 778 | err = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor); |
| 780 | if (!gss_auth->mech) { |
James Morris | 3392c34 | 2007-12-26 11:20:43 +1100 | [diff] [blame] | 781 | printk(KERN_WARNING "%s: Pseudoflavor %d not found!\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 782 | __func__, flavor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | goto err_free; |
| 784 | } |
| 785 | gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor); |
J. Bruce Fields | 438b6fd | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 786 | if (gss_auth->service == 0) |
| 787 | goto err_put_mech; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | auth = &gss_auth->rpc_auth; |
| 789 | auth->au_cslack = GSS_CRED_SLACK >> 2; |
| 790 | auth->au_rslack = GSS_VERF_SLACK >> 2; |
| 791 | auth->au_ops = &authgss_ops; |
| 792 | auth->au_flavor = flavor; |
| 793 | atomic_set(&auth->au_count, 1); |
Trond Myklebust | 0285ed1 | 2007-06-27 14:29:12 -0400 | [diff] [blame] | 794 | kref_init(&gss_auth->kref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | |
\"J. Bruce Fields\ | 34769fc | 2008-12-23 16:16:37 -0500 | [diff] [blame] | 796 | /* |
| 797 | * Note: if we created the old pipe first, then someone who |
| 798 | * examined the directory at the right moment might conclude |
| 799 | * that we supported only the old pipe. So we instead create |
| 800 | * the new pipe first. |
| 801 | */ |
Trond Myklebust | 7d217ca | 2009-08-09 15:14:24 -0400 | [diff] [blame] | 802 | gss_auth->dentry[1] = rpc_mkpipe(clnt->cl_path.dentry, |
\"J. Bruce Fields\ | 34769fc | 2008-12-23 16:16:37 -0500 | [diff] [blame] | 803 | "gssd", |
| 804 | clnt, &gss_upcall_ops_v1, |
| 805 | RPC_PIPE_WAIT_FOR_OPEN); |
| 806 | if (IS_ERR(gss_auth->dentry[1])) { |
| 807 | err = PTR_ERR(gss_auth->dentry[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | goto err_put_mech; |
J. Bruce Fields | 6a19275 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 809 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | |
Trond Myklebust | 7d217ca | 2009-08-09 15:14:24 -0400 | [diff] [blame] | 811 | gss_auth->dentry[0] = rpc_mkpipe(clnt->cl_path.dentry, |
\"J. Bruce Fields\ | 34769fc | 2008-12-23 16:16:37 -0500 | [diff] [blame] | 812 | gss_auth->mech->gm_name, |
| 813 | clnt, &gss_upcall_ops_v0, |
| 814 | RPC_PIPE_WAIT_FOR_OPEN); |
| 815 | if (IS_ERR(gss_auth->dentry[0])) { |
| 816 | err = PTR_ERR(gss_auth->dentry[0]); |
| 817 | goto err_unlink_pipe_1; |
| 818 | } |
Trond Myklebust | f5c2187 | 2007-06-25 17:11:20 -0400 | [diff] [blame] | 819 | err = rpcauth_init_credcache(auth); |
Trond Myklebust | 07a2bf1 | 2007-06-09 15:42:01 -0400 | [diff] [blame] | 820 | if (err) |
\"J. Bruce Fields\ | 34769fc | 2008-12-23 16:16:37 -0500 | [diff] [blame] | 821 | goto err_unlink_pipe_0; |
Trond Myklebust | 07a2bf1 | 2007-06-09 15:42:01 -0400 | [diff] [blame] | 822 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | return auth; |
\"J. Bruce Fields\ | 34769fc | 2008-12-23 16:16:37 -0500 | [diff] [blame] | 824 | err_unlink_pipe_0: |
| 825 | rpc_unlink(gss_auth->dentry[0]); |
| 826 | err_unlink_pipe_1: |
| 827 | rpc_unlink(gss_auth->dentry[1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | err_put_mech: |
| 829 | gss_mech_put(gss_auth->mech); |
| 830 | err_free: |
| 831 | kfree(gss_auth); |
| 832 | out_dec: |
| 833 | module_put(THIS_MODULE); |
J. Bruce Fields | 6a19275 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 834 | return ERR_PTR(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | } |
| 836 | |
| 837 | static void |
Trond Myklebust | 0285ed1 | 2007-06-27 14:29:12 -0400 | [diff] [blame] | 838 | gss_free(struct gss_auth *gss_auth) |
| 839 | { |
\"J. Bruce Fields\ | 34769fc | 2008-12-23 16:16:37 -0500 | [diff] [blame] | 840 | rpc_unlink(gss_auth->dentry[1]); |
| 841 | rpc_unlink(gss_auth->dentry[0]); |
Trond Myklebust | 0285ed1 | 2007-06-27 14:29:12 -0400 | [diff] [blame] | 842 | gss_mech_put(gss_auth->mech); |
| 843 | |
| 844 | kfree(gss_auth); |
| 845 | module_put(THIS_MODULE); |
| 846 | } |
| 847 | |
| 848 | static void |
| 849 | gss_free_callback(struct kref *kref) |
| 850 | { |
| 851 | struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref); |
| 852 | |
| 853 | gss_free(gss_auth); |
| 854 | } |
| 855 | |
| 856 | static void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | gss_destroy(struct rpc_auth *auth) |
| 858 | { |
| 859 | struct gss_auth *gss_auth; |
| 860 | |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 861 | dprintk("RPC: destroying GSS authenticator %p flavor %d\n", |
| 862 | auth, auth->au_flavor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | |
Trond Myklebust | 3ab9bb7 | 2007-06-09 15:41:42 -0400 | [diff] [blame] | 864 | rpcauth_destroy_credcache(auth); |
| 865 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | gss_auth = container_of(auth, struct gss_auth, rpc_auth); |
Trond Myklebust | 0285ed1 | 2007-06-27 14:29:12 -0400 | [diff] [blame] | 867 | kref_put(&gss_auth->kref, gss_free_callback); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | } |
| 869 | |
Trond Myklebust | 0df7fb7 | 2007-06-26 17:04:57 -0400 | [diff] [blame] | 870 | /* |
| 871 | * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call |
| 872 | * to the server with the GSS control procedure field set to |
| 873 | * RPC_GSS_PROC_DESTROY. This should normally cause the server to release |
| 874 | * all RPCSEC_GSS state associated with that context. |
| 875 | */ |
| 876 | static int |
| 877 | gss_destroying_context(struct rpc_cred *cred) |
| 878 | { |
| 879 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); |
| 880 | struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); |
| 881 | struct rpc_task *task; |
| 882 | |
| 883 | if (gss_cred->gc_ctx == NULL || |
Jeff Layton | 6dcd392 | 2008-12-23 15:21:57 -0500 | [diff] [blame] | 884 | test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0) |
Trond Myklebust | 0df7fb7 | 2007-06-26 17:04:57 -0400 | [diff] [blame] | 885 | return 0; |
| 886 | |
| 887 | gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY; |
| 888 | cred->cr_ops = &gss_nullops; |
| 889 | |
| 890 | /* Take a reference to ensure the cred will be destroyed either |
| 891 | * by the RPC call or by the put_rpccred() below */ |
| 892 | get_rpccred(cred); |
| 893 | |
Trond Myklebust | 080a1f1 | 2008-04-19 14:22:31 -0400 | [diff] [blame] | 894 | 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] | 895 | if (!IS_ERR(task)) |
| 896 | rpc_put_task(task); |
| 897 | |
| 898 | put_rpccred(cred); |
| 899 | return 1; |
| 900 | } |
| 901 | |
| 902 | /* 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] | 903 | * to create a new cred or context, so they check that things have been |
| 904 | * allocated before freeing them. */ |
| 905 | static void |
Trond Myklebust | 5d28dc8 | 2007-06-26 19:18:38 -0400 | [diff] [blame] | 906 | gss_do_free_ctx(struct gss_cl_ctx *ctx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | { |
Trond Myklebust | 5d28dc8 | 2007-06-26 19:18:38 -0400 | [diff] [blame] | 908 | dprintk("RPC: gss_free_ctx\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | |
Trond Myklebust | 0d8a374 | 2010-08-01 20:14:55 -0400 | [diff] [blame] | 910 | gss_delete_sec_context(&ctx->gc_gss_ctx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | kfree(ctx->gc_wire_ctx.data); |
| 912 | kfree(ctx); |
| 913 | } |
| 914 | |
| 915 | static void |
Trond Myklebust | 5d28dc8 | 2007-06-26 19:18:38 -0400 | [diff] [blame] | 916 | gss_free_ctx_callback(struct rcu_head *head) |
| 917 | { |
| 918 | struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu); |
| 919 | gss_do_free_ctx(ctx); |
| 920 | } |
| 921 | |
| 922 | static void |
| 923 | gss_free_ctx(struct gss_cl_ctx *ctx) |
| 924 | { |
| 925 | call_rcu(&ctx->gc_rcu, gss_free_ctx_callback); |
| 926 | } |
| 927 | |
| 928 | static void |
Trond Myklebust | 31be5bf | 2007-06-24 15:55:26 -0400 | [diff] [blame] | 929 | gss_free_cred(struct gss_cred *gss_cred) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | { |
Trond Myklebust | 31be5bf | 2007-06-24 15:55:26 -0400 | [diff] [blame] | 931 | dprintk("RPC: gss_free_cred %p\n", gss_cred); |
Trond Myklebust | 31be5bf | 2007-06-24 15:55:26 -0400 | [diff] [blame] | 932 | kfree(gss_cred); |
| 933 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | |
Trond Myklebust | 31be5bf | 2007-06-24 15:55:26 -0400 | [diff] [blame] | 935 | static void |
| 936 | gss_free_cred_callback(struct rcu_head *head) |
| 937 | { |
| 938 | struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu); |
| 939 | gss_free_cred(gss_cred); |
| 940 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | |
Trond Myklebust | 31be5bf | 2007-06-24 15:55:26 -0400 | [diff] [blame] | 942 | static void |
Jeff Layton | 6dcd392 | 2008-12-23 15:21:57 -0500 | [diff] [blame] | 943 | gss_destroy_nullcred(struct rpc_cred *cred) |
Trond Myklebust | 31be5bf | 2007-06-24 15:55:26 -0400 | [diff] [blame] | 944 | { |
Trond Myklebust | 5d28dc8 | 2007-06-26 19:18:38 -0400 | [diff] [blame] | 945 | 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] | 946 | 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] | 947 | struct gss_cl_ctx *ctx = gss_cred->gc_ctx; |
| 948 | |
Stephen Hemminger | a9b3cd7 | 2011-08-01 16:19:00 +0000 | [diff] [blame] | 949 | RCU_INIT_POINTER(gss_cred->gc_ctx, NULL); |
Trond Myklebust | 31be5bf | 2007-06-24 15:55:26 -0400 | [diff] [blame] | 950 | call_rcu(&cred->cr_rcu, gss_free_cred_callback); |
Trond Myklebust | 5d28dc8 | 2007-06-26 19:18:38 -0400 | [diff] [blame] | 951 | if (ctx) |
| 952 | gss_put_ctx(ctx); |
Trond Myklebust | 0285ed1 | 2007-06-27 14:29:12 -0400 | [diff] [blame] | 953 | kref_put(&gss_auth->kref, gss_free_callback); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | } |
| 955 | |
Jeff Layton | 6dcd392 | 2008-12-23 15:21:57 -0500 | [diff] [blame] | 956 | static void |
| 957 | gss_destroy_cred(struct rpc_cred *cred) |
| 958 | { |
| 959 | |
| 960 | if (gss_destroying_context(cred)) |
| 961 | return; |
| 962 | gss_destroy_nullcred(cred); |
| 963 | } |
| 964 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 965 | /* |
| 966 | * Lookup RPCSEC_GSS cred for the current process |
| 967 | */ |
| 968 | static struct rpc_cred * |
Trond Myklebust | 8a31776 | 2006-02-01 12:18:36 -0500 | [diff] [blame] | 969 | 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] | 970 | { |
Trond Myklebust | 8a31776 | 2006-02-01 12:18:36 -0500 | [diff] [blame] | 971 | return rpcauth_lookup_credcache(auth, acred, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | } |
| 973 | |
| 974 | static struct rpc_cred * |
Trond Myklebust | 8a31776 | 2006-02-01 12:18:36 -0500 | [diff] [blame] | 975 | 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] | 976 | { |
| 977 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); |
| 978 | struct gss_cred *cred = NULL; |
| 979 | int err = -ENOMEM; |
| 980 | |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 981 | dprintk("RPC: gss_create_cred for uid %d, flavor %d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 982 | acred->uid, auth->au_flavor); |
| 983 | |
Trond Myklebust | 0f38b87 | 2008-06-10 18:31:01 -0400 | [diff] [blame] | 984 | if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | goto out_err; |
| 986 | |
Trond Myklebust | 5fe4755 | 2007-06-23 19:55:31 -0400 | [diff] [blame] | 987 | rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | /* |
| 989 | * Note: in order to force a call to call_refresh(), we deliberately |
| 990 | * fail to flag the credential as RPCAUTH_CRED_UPTODATE. |
| 991 | */ |
Trond Myklebust | fc432dd | 2007-06-25 10:15:15 -0400 | [diff] [blame] | 992 | cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | cred->gc_service = gss_auth->service; |
Trond Myklebust | 68c9715 | 2012-01-03 13:22:46 -0500 | [diff] [blame] | 994 | cred->gc_principal = NULL; |
| 995 | if (acred->machine_cred) |
| 996 | cred->gc_principal = acred->principal; |
Trond Myklebust | 0285ed1 | 2007-06-27 14:29:12 -0400 | [diff] [blame] | 997 | kref_get(&gss_auth->kref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | return &cred->gc_base; |
| 999 | |
| 1000 | out_err: |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 1001 | dprintk("RPC: gss_create_cred failed with error %d\n", err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | return ERR_PTR(err); |
| 1003 | } |
| 1004 | |
| 1005 | static int |
Trond Myklebust | fba3bad | 2006-02-01 12:19:27 -0500 | [diff] [blame] | 1006 | gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) |
| 1007 | { |
| 1008 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); |
| 1009 | struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); |
| 1010 | int err; |
| 1011 | |
| 1012 | do { |
| 1013 | err = gss_create_upcall(gss_auth, gss_cred); |
| 1014 | } while (err == -EAGAIN); |
| 1015 | return err; |
| 1016 | } |
| 1017 | |
| 1018 | static int |
Trond Myklebust | 8a31776 | 2006-02-01 12:18:36 -0500 | [diff] [blame] | 1019 | gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | { |
| 1021 | struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); |
| 1022 | |
Trond Myklebust | cd019f7 | 2008-04-17 17:03:58 -0400 | [diff] [blame] | 1023 | if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) |
Trond Myklebust | 8a31776 | 2006-02-01 12:18:36 -0500 | [diff] [blame] | 1024 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | /* Don't match with creds that have expired. */ |
Trond Myklebust | cd019f7 | 2008-04-17 17:03:58 -0400 | [diff] [blame] | 1026 | if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) |
| 1027 | return 0; |
| 1028 | if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | return 0; |
Trond Myklebust | 8a31776 | 2006-02-01 12:18:36 -0500 | [diff] [blame] | 1030 | out: |
Trond Myklebust | 68c9715 | 2012-01-03 13:22:46 -0500 | [diff] [blame] | 1031 | if (acred->principal != NULL) { |
| 1032 | if (gss_cred->gc_principal == NULL) |
| 1033 | return 0; |
| 1034 | return strcmp(acred->principal, gss_cred->gc_principal) == 0; |
| 1035 | } |
| 1036 | if (gss_cred->gc_principal != NULL) |
Trond Myklebust | 7c67db3 | 2008-04-07 20:50:11 -0400 | [diff] [blame] | 1037 | return 0; |
Eric Dumazet | a02cec2 | 2010-09-22 20:43:57 +0000 | [diff] [blame] | 1038 | return rc->cr_uid == acred->uid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1039 | } |
| 1040 | |
| 1041 | /* |
| 1042 | * Marshal credentials. |
| 1043 | * Maybe we should keep a cached credential for performance reasons. |
| 1044 | */ |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1045 | static __be32 * |
| 1046 | gss_marshal(struct rpc_task *task, __be32 *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | { |
Trond Myklebust | a17c215 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 1048 | struct rpc_rqst *req = task->tk_rqstp; |
| 1049 | struct rpc_cred *cred = req->rq_cred; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1050 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
| 1051 | gc_base); |
| 1052 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1053 | __be32 *cred_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1054 | u32 maj_stat = 0; |
| 1055 | struct xdr_netobj mic; |
| 1056 | struct kvec iov; |
| 1057 | struct xdr_buf verf_buf; |
| 1058 | |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 1059 | dprintk("RPC: %5u gss_marshal\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | |
| 1061 | *p++ = htonl(RPC_AUTH_GSS); |
| 1062 | cred_len = p++; |
| 1063 | |
| 1064 | spin_lock(&ctx->gc_seq_lock); |
| 1065 | req->rq_seqno = ctx->gc_seq++; |
| 1066 | spin_unlock(&ctx->gc_seq_lock); |
| 1067 | |
| 1068 | *p++ = htonl((u32) RPC_GSS_VERSION); |
| 1069 | *p++ = htonl((u32) ctx->gc_proc); |
| 1070 | *p++ = htonl((u32) req->rq_seqno); |
| 1071 | *p++ = htonl((u32) gss_cred->gc_service); |
| 1072 | p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); |
| 1073 | *cred_len = htonl((p - (cred_len + 1)) << 2); |
| 1074 | |
| 1075 | /* We compute the checksum for the verifier over the xdr-encoded bytes |
| 1076 | * starting with the xid and ending at the end of the credential: */ |
Chuck Lever | 808012f | 2005-08-25 16:25:49 -0700 | [diff] [blame] | 1077 | iov.iov_base = xprt_skip_transport_header(task->tk_xprt, |
| 1078 | req->rq_snd_buf.head[0].iov_base); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1079 | iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; |
| 1080 | xdr_buf_from_iov(&iov, &verf_buf); |
| 1081 | |
| 1082 | /* set verifier flavor*/ |
| 1083 | *p++ = htonl(RPC_AUTH_GSS); |
| 1084 | |
| 1085 | mic.data = (u8 *)(p + 1); |
J. Bruce Fields | 00fd6e1 | 2005-10-13 16:55:18 -0400 | [diff] [blame] | 1086 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) { |
Trond Myklebust | fc432dd | 2007-06-25 10:15:15 -0400 | [diff] [blame] | 1088 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | } else if (maj_stat != 0) { |
| 1090 | printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); |
| 1091 | goto out_put_ctx; |
| 1092 | } |
| 1093 | p = xdr_encode_opaque(p, NULL, mic.len); |
| 1094 | gss_put_ctx(ctx); |
| 1095 | return p; |
| 1096 | out_put_ctx: |
| 1097 | gss_put_ctx(ctx); |
| 1098 | return NULL; |
| 1099 | } |
| 1100 | |
Trond Myklebust | cd019f7 | 2008-04-17 17:03:58 -0400 | [diff] [blame] | 1101 | static int gss_renew_cred(struct rpc_task *task) |
| 1102 | { |
Trond Myklebust | a17c215 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 1103 | struct rpc_cred *oldcred = task->tk_rqstp->rq_cred; |
Trond Myklebust | cd019f7 | 2008-04-17 17:03:58 -0400 | [diff] [blame] | 1104 | struct gss_cred *gss_cred = container_of(oldcred, |
| 1105 | struct gss_cred, |
| 1106 | gc_base); |
| 1107 | struct rpc_auth *auth = oldcred->cr_auth; |
| 1108 | struct auth_cred acred = { |
| 1109 | .uid = oldcred->cr_uid, |
Trond Myklebust | 68c9715 | 2012-01-03 13:22:46 -0500 | [diff] [blame] | 1110 | .principal = gss_cred->gc_principal, |
| 1111 | .machine_cred = (gss_cred->gc_principal != NULL ? 1 : 0), |
Trond Myklebust | cd019f7 | 2008-04-17 17:03:58 -0400 | [diff] [blame] | 1112 | }; |
| 1113 | struct rpc_cred *new; |
| 1114 | |
| 1115 | new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW); |
| 1116 | if (IS_ERR(new)) |
| 1117 | return PTR_ERR(new); |
Trond Myklebust | a17c215 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 1118 | task->tk_rqstp->rq_cred = new; |
Trond Myklebust | cd019f7 | 2008-04-17 17:03:58 -0400 | [diff] [blame] | 1119 | put_rpccred(oldcred); |
| 1120 | return 0; |
| 1121 | } |
| 1122 | |
Trond Myklebust | 126e216 | 2010-05-13 12:55:38 -0400 | [diff] [blame] | 1123 | static int gss_cred_is_negative_entry(struct rpc_cred *cred) |
| 1124 | { |
| 1125 | if (test_bit(RPCAUTH_CRED_NEGATIVE, &cred->cr_flags)) { |
| 1126 | unsigned long now = jiffies; |
| 1127 | unsigned long begin, expire; |
| 1128 | struct gss_cred *gss_cred; |
| 1129 | |
| 1130 | gss_cred = container_of(cred, struct gss_cred, gc_base); |
| 1131 | begin = gss_cred->gc_upcall_timestamp; |
| 1132 | expire = begin + gss_expired_cred_retry_delay * HZ; |
| 1133 | |
| 1134 | if (time_in_range_open(now, begin, expire)) |
| 1135 | return 1; |
| 1136 | } |
| 1137 | return 0; |
| 1138 | } |
| 1139 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | /* |
| 1141 | * Refresh credentials. XXX - finish |
| 1142 | */ |
| 1143 | static int |
| 1144 | gss_refresh(struct rpc_task *task) |
| 1145 | { |
Trond Myklebust | a17c215 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 1146 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
Trond Myklebust | cd019f7 | 2008-04-17 17:03:58 -0400 | [diff] [blame] | 1147 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1148 | |
Trond Myklebust | 126e216 | 2010-05-13 12:55:38 -0400 | [diff] [blame] | 1149 | if (gss_cred_is_negative_entry(cred)) |
| 1150 | return -EKEYEXPIRED; |
| 1151 | |
Trond Myklebust | cd019f7 | 2008-04-17 17:03:58 -0400 | [diff] [blame] | 1152 | if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) && |
| 1153 | !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) { |
| 1154 | ret = gss_renew_cred(task); |
| 1155 | if (ret < 0) |
| 1156 | goto out; |
Trond Myklebust | a17c215 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 1157 | cred = task->tk_rqstp->rq_cred; |
Trond Myklebust | cd019f7 | 2008-04-17 17:03:58 -0400 | [diff] [blame] | 1158 | } |
| 1159 | |
| 1160 | if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) |
| 1161 | ret = gss_refresh_upcall(task); |
| 1162 | out: |
| 1163 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | } |
| 1165 | |
Trond Myklebust | 0df7fb7 | 2007-06-26 17:04:57 -0400 | [diff] [blame] | 1166 | /* Dummy refresh routine: used only when destroying the context */ |
| 1167 | static int |
| 1168 | gss_refresh_null(struct rpc_task *task) |
| 1169 | { |
| 1170 | return -EACCES; |
| 1171 | } |
| 1172 | |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1173 | static __be32 * |
| 1174 | gss_validate(struct rpc_task *task, __be32 *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1175 | { |
Trond Myklebust | a17c215 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 1176 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1177 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1178 | __be32 seq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1179 | struct kvec iov; |
| 1180 | struct xdr_buf verf_buf; |
| 1181 | struct xdr_netobj mic; |
| 1182 | u32 flav,len; |
| 1183 | u32 maj_stat; |
| 1184 | |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 1185 | dprintk("RPC: %5u gss_validate\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1186 | |
| 1187 | flav = ntohl(*p++); |
| 1188 | if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 1189 | goto out_bad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1190 | if (flav != RPC_AUTH_GSS) |
| 1191 | goto out_bad; |
| 1192 | seq = htonl(task->tk_rqstp->rq_seqno); |
| 1193 | iov.iov_base = &seq; |
| 1194 | iov.iov_len = sizeof(seq); |
| 1195 | xdr_buf_from_iov(&iov, &verf_buf); |
| 1196 | mic.data = (u8 *)p; |
| 1197 | mic.len = len; |
| 1198 | |
J. Bruce Fields | 00fd6e1 | 2005-10-13 16:55:18 -0400 | [diff] [blame] | 1199 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1200 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
Trond Myklebust | fc432dd | 2007-06-25 10:15:15 -0400 | [diff] [blame] | 1201 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
Trond Myklebust | 0df7fb7 | 2007-06-26 17:04:57 -0400 | [diff] [blame] | 1202 | if (maj_stat) { |
Joe Perches | 014313a | 2007-11-19 17:53:43 -0800 | [diff] [blame] | 1203 | dprintk("RPC: %5u gss_validate: gss_verify_mic returned " |
Trond Myklebust | 0df7fb7 | 2007-06-26 17:04:57 -0400 | [diff] [blame] | 1204 | "error 0x%08x\n", task->tk_pid, maj_stat); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1205 | goto out_bad; |
Trond Myklebust | 0df7fb7 | 2007-06-26 17:04:57 -0400 | [diff] [blame] | 1206 | } |
J. Bruce Fields | 24b2605 | 2005-10-13 16:54:53 -0400 | [diff] [blame] | 1207 | /* We leave it to unwrap to calculate au_rslack. For now we just |
| 1208 | * calculate the length of the verifier: */ |
Trond Myklebust | 1be27f3 | 2007-06-27 14:29:04 -0400 | [diff] [blame] | 1209 | cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1210 | gss_put_ctx(ctx); |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 1211 | dprintk("RPC: %5u gss_validate: gss_verify_mic succeeded.\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1212 | task->tk_pid); |
| 1213 | return p + XDR_QUADLEN(len); |
| 1214 | out_bad: |
| 1215 | gss_put_ctx(ctx); |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 1216 | dprintk("RPC: %5u gss_validate failed.\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1217 | return NULL; |
| 1218 | } |
| 1219 | |
Chuck Lever | 9f06c71 | 2010-12-14 14:59:18 +0000 | [diff] [blame] | 1220 | static void gss_wrap_req_encode(kxdreproc_t encode, struct rpc_rqst *rqstp, |
| 1221 | __be32 *p, void *obj) |
| 1222 | { |
| 1223 | struct xdr_stream xdr; |
| 1224 | |
| 1225 | xdr_init_encode(&xdr, &rqstp->rq_snd_buf, p); |
| 1226 | encode(rqstp, &xdr, obj); |
| 1227 | } |
| 1228 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1229 | static inline int |
| 1230 | gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, |
Chuck Lever | 9f06c71 | 2010-12-14 14:59:18 +0000 | [diff] [blame] | 1231 | kxdreproc_t encode, struct rpc_rqst *rqstp, |
| 1232 | __be32 *p, void *obj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1233 | { |
| 1234 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; |
| 1235 | struct xdr_buf integ_buf; |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1236 | __be32 *integ_len = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1237 | struct xdr_netobj mic; |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1238 | u32 offset; |
| 1239 | __be32 *q; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | struct kvec *iov; |
| 1241 | u32 maj_stat = 0; |
| 1242 | int status = -EIO; |
| 1243 | |
| 1244 | integ_len = p++; |
| 1245 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; |
| 1246 | *p++ = htonl(rqstp->rq_seqno); |
| 1247 | |
Chuck Lever | 9f06c71 | 2010-12-14 14:59:18 +0000 | [diff] [blame] | 1248 | gss_wrap_req_encode(encode, rqstp, p, obj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1249 | |
| 1250 | if (xdr_buf_subsegment(snd_buf, &integ_buf, |
| 1251 | offset, snd_buf->len - offset)) |
| 1252 | return status; |
| 1253 | *integ_len = htonl(integ_buf.len); |
| 1254 | |
| 1255 | /* guess whether we're in the head or the tail: */ |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 1256 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1257 | iov = snd_buf->tail; |
| 1258 | else |
| 1259 | iov = snd_buf->head; |
| 1260 | p = iov->iov_base + iov->iov_len; |
| 1261 | mic.data = (u8 *)(p + 1); |
| 1262 | |
J. Bruce Fields | 00fd6e1 | 2005-10-13 16:55:18 -0400 | [diff] [blame] | 1263 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1264 | status = -EIO; /* XXX? */ |
| 1265 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
Trond Myklebust | fc432dd | 2007-06-25 10:15:15 -0400 | [diff] [blame] | 1266 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1267 | else if (maj_stat) |
| 1268 | return status; |
| 1269 | q = xdr_encode_opaque(p, NULL, mic.len); |
| 1270 | |
| 1271 | offset = (u8 *)q - (u8 *)p; |
| 1272 | iov->iov_len += offset; |
| 1273 | snd_buf->len += offset; |
| 1274 | return 0; |
| 1275 | } |
| 1276 | |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1277 | static void |
| 1278 | priv_release_snd_buf(struct rpc_rqst *rqstp) |
| 1279 | { |
| 1280 | int i; |
| 1281 | |
| 1282 | for (i=0; i < rqstp->rq_enc_pages_num; i++) |
| 1283 | __free_page(rqstp->rq_enc_pages[i]); |
| 1284 | kfree(rqstp->rq_enc_pages); |
| 1285 | } |
| 1286 | |
| 1287 | static int |
| 1288 | alloc_enc_pages(struct rpc_rqst *rqstp) |
| 1289 | { |
| 1290 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; |
| 1291 | int first, last, i; |
| 1292 | |
| 1293 | if (snd_buf->page_len == 0) { |
| 1294 | rqstp->rq_enc_pages_num = 0; |
| 1295 | return 0; |
| 1296 | } |
| 1297 | |
| 1298 | first = snd_buf->page_base >> PAGE_CACHE_SHIFT; |
| 1299 | last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT; |
| 1300 | rqstp->rq_enc_pages_num = last - first + 1 + 1; |
| 1301 | rqstp->rq_enc_pages |
| 1302 | = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *), |
| 1303 | GFP_NOFS); |
| 1304 | if (!rqstp->rq_enc_pages) |
| 1305 | goto out; |
| 1306 | for (i=0; i < rqstp->rq_enc_pages_num; i++) { |
| 1307 | rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); |
| 1308 | if (rqstp->rq_enc_pages[i] == NULL) |
| 1309 | goto out_free; |
| 1310 | } |
| 1311 | rqstp->rq_release_snd_buf = priv_release_snd_buf; |
| 1312 | return 0; |
| 1313 | out_free: |
Trond Myklebust | cdead7c | 2010-03-19 15:36:22 -0400 | [diff] [blame] | 1314 | rqstp->rq_enc_pages_num = i; |
| 1315 | priv_release_snd_buf(rqstp); |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1316 | out: |
| 1317 | return -EAGAIN; |
| 1318 | } |
| 1319 | |
| 1320 | static inline int |
| 1321 | gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, |
Chuck Lever | 9f06c71 | 2010-12-14 14:59:18 +0000 | [diff] [blame] | 1322 | kxdreproc_t encode, struct rpc_rqst *rqstp, |
| 1323 | __be32 *p, void *obj) |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1324 | { |
| 1325 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; |
| 1326 | u32 offset; |
| 1327 | u32 maj_stat; |
| 1328 | int status; |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1329 | __be32 *opaque_len; |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1330 | struct page **inpages; |
| 1331 | int first; |
| 1332 | int pad; |
| 1333 | struct kvec *iov; |
| 1334 | char *tmp; |
| 1335 | |
| 1336 | opaque_len = p++; |
| 1337 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; |
| 1338 | *p++ = htonl(rqstp->rq_seqno); |
| 1339 | |
Chuck Lever | 9f06c71 | 2010-12-14 14:59:18 +0000 | [diff] [blame] | 1340 | gss_wrap_req_encode(encode, rqstp, p, obj); |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1341 | |
| 1342 | status = alloc_enc_pages(rqstp); |
| 1343 | if (status) |
| 1344 | return status; |
| 1345 | first = snd_buf->page_base >> PAGE_CACHE_SHIFT; |
| 1346 | inpages = snd_buf->pages + first; |
| 1347 | snd_buf->pages = rqstp->rq_enc_pages; |
| 1348 | snd_buf->page_base -= first << PAGE_CACHE_SHIFT; |
Kevin Coffman | 7561042 | 2010-03-17 13:02:47 -0400 | [diff] [blame] | 1349 | /* |
| 1350 | * Give the tail its own page, in case we need extra space in the |
| 1351 | * head when wrapping: |
| 1352 | * |
| 1353 | * call_allocate() allocates twice the slack space required |
| 1354 | * by the authentication flavor to rq_callsize. |
| 1355 | * For GSS, slack is GSS_CRED_SLACK. |
| 1356 | */ |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1357 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) { |
| 1358 | tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); |
| 1359 | memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); |
| 1360 | snd_buf->tail[0].iov_base = tmp; |
| 1361 | } |
J. Bruce Fields | 00fd6e1 | 2005-10-13 16:55:18 -0400 | [diff] [blame] | 1362 | maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); |
Kevin Coffman | 7561042 | 2010-03-17 13:02:47 -0400 | [diff] [blame] | 1363 | /* slack space should prevent this ever happening: */ |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1364 | BUG_ON(snd_buf->len > snd_buf->buflen); |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 1365 | status = -EIO; |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1366 | /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was |
| 1367 | * done anyway, so it's safe to put the request on the wire: */ |
| 1368 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
Trond Myklebust | fc432dd | 2007-06-25 10:15:15 -0400 | [diff] [blame] | 1369 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1370 | else if (maj_stat) |
| 1371 | return status; |
| 1372 | |
| 1373 | *opaque_len = htonl(snd_buf->len - offset); |
| 1374 | /* guess whether we're in the head or the tail: */ |
| 1375 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) |
| 1376 | iov = snd_buf->tail; |
| 1377 | else |
| 1378 | iov = snd_buf->head; |
| 1379 | p = iov->iov_base + iov->iov_len; |
| 1380 | pad = 3 - ((snd_buf->len - offset - 1) & 3); |
| 1381 | memset(p, 0, pad); |
| 1382 | iov->iov_len += pad; |
| 1383 | snd_buf->len += pad; |
| 1384 | |
| 1385 | return 0; |
| 1386 | } |
| 1387 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1388 | static int |
| 1389 | gss_wrap_req(struct rpc_task *task, |
Chuck Lever | 9f06c71 | 2010-12-14 14:59:18 +0000 | [diff] [blame] | 1390 | kxdreproc_t encode, void *rqstp, __be32 *p, void *obj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1391 | { |
Trond Myklebust | a17c215 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 1392 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1393 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
| 1394 | gc_base); |
| 1395 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); |
| 1396 | int status = -EIO; |
| 1397 | |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 1398 | dprintk("RPC: %5u gss_wrap_req\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1399 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) { |
| 1400 | /* The spec seems a little ambiguous here, but I think that not |
| 1401 | * wrapping context destruction requests makes the most sense. |
| 1402 | */ |
Chuck Lever | 9f06c71 | 2010-12-14 14:59:18 +0000 | [diff] [blame] | 1403 | gss_wrap_req_encode(encode, rqstp, p, obj); |
| 1404 | status = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1405 | goto out; |
| 1406 | } |
| 1407 | switch (gss_cred->gc_service) { |
Joe Perches | 89f0e4f | 2011-07-01 09:43:12 +0000 | [diff] [blame] | 1408 | case RPC_GSS_SVC_NONE: |
| 1409 | gss_wrap_req_encode(encode, rqstp, p, obj); |
| 1410 | status = 0; |
| 1411 | break; |
| 1412 | case RPC_GSS_SVC_INTEGRITY: |
| 1413 | status = gss_wrap_req_integ(cred, ctx, encode, rqstp, p, obj); |
| 1414 | break; |
| 1415 | case RPC_GSS_SVC_PRIVACY: |
| 1416 | status = gss_wrap_req_priv(cred, ctx, encode, rqstp, p, obj); |
| 1417 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1418 | } |
| 1419 | out: |
| 1420 | gss_put_ctx(ctx); |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 1421 | 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] | 1422 | return status; |
| 1423 | } |
| 1424 | |
| 1425 | static inline int |
| 1426 | 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] | 1427 | struct rpc_rqst *rqstp, __be32 **p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1428 | { |
| 1429 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; |
| 1430 | struct xdr_buf integ_buf; |
| 1431 | struct xdr_netobj mic; |
| 1432 | u32 data_offset, mic_offset; |
| 1433 | u32 integ_len; |
| 1434 | u32 maj_stat; |
| 1435 | int status = -EIO; |
| 1436 | |
| 1437 | integ_len = ntohl(*(*p)++); |
| 1438 | if (integ_len & 3) |
| 1439 | return status; |
| 1440 | data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; |
| 1441 | mic_offset = integ_len + data_offset; |
| 1442 | if (mic_offset > rcv_buf->len) |
| 1443 | return status; |
| 1444 | if (ntohl(*(*p)++) != rqstp->rq_seqno) |
| 1445 | return status; |
| 1446 | |
| 1447 | if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, |
| 1448 | mic_offset - data_offset)) |
| 1449 | return status; |
| 1450 | |
| 1451 | if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) |
| 1452 | return status; |
| 1453 | |
J. Bruce Fields | 00fd6e1 | 2005-10-13 16:55:18 -0400 | [diff] [blame] | 1454 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1455 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
Trond Myklebust | fc432dd | 2007-06-25 10:15:15 -0400 | [diff] [blame] | 1456 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1457 | if (maj_stat != GSS_S_COMPLETE) |
| 1458 | return status; |
| 1459 | return 0; |
| 1460 | } |
| 1461 | |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1462 | static inline int |
| 1463 | 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] | 1464 | struct rpc_rqst *rqstp, __be32 **p) |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1465 | { |
| 1466 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; |
| 1467 | u32 offset; |
| 1468 | u32 opaque_len; |
| 1469 | u32 maj_stat; |
| 1470 | int status = -EIO; |
| 1471 | |
| 1472 | opaque_len = ntohl(*(*p)++); |
| 1473 | offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; |
| 1474 | if (offset + opaque_len > rcv_buf->len) |
| 1475 | return status; |
| 1476 | /* remove padding: */ |
| 1477 | rcv_buf->len = offset + opaque_len; |
| 1478 | |
J. Bruce Fields | 00fd6e1 | 2005-10-13 16:55:18 -0400 | [diff] [blame] | 1479 | maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1480 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
Trond Myklebust | fc432dd | 2007-06-25 10:15:15 -0400 | [diff] [blame] | 1481 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1482 | if (maj_stat != GSS_S_COMPLETE) |
| 1483 | return status; |
| 1484 | if (ntohl(*(*p)++) != rqstp->rq_seqno) |
| 1485 | return status; |
| 1486 | |
| 1487 | return 0; |
| 1488 | } |
| 1489 | |
Chuck Lever | bf26955 | 2010-12-14 14:59:29 +0000 | [diff] [blame] | 1490 | static int |
| 1491 | gss_unwrap_req_decode(kxdrdproc_t decode, struct rpc_rqst *rqstp, |
| 1492 | __be32 *p, void *obj) |
| 1493 | { |
| 1494 | struct xdr_stream xdr; |
| 1495 | |
| 1496 | xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p); |
| 1497 | return decode(rqstp, &xdr, obj); |
| 1498 | } |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1499 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1500 | static int |
| 1501 | gss_unwrap_resp(struct rpc_task *task, |
Chuck Lever | bf26955 | 2010-12-14 14:59:29 +0000 | [diff] [blame] | 1502 | kxdrdproc_t decode, void *rqstp, __be32 *p, void *obj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1503 | { |
Trond Myklebust | a17c215 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 1504 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1505 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
| 1506 | gc_base); |
| 1507 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1508 | __be32 *savedp = p; |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1509 | struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; |
| 1510 | int savedlen = head->iov_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1511 | int status = -EIO; |
| 1512 | |
| 1513 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) |
| 1514 | goto out_decode; |
| 1515 | switch (gss_cred->gc_service) { |
Joe Perches | 89f0e4f | 2011-07-01 09:43:12 +0000 | [diff] [blame] | 1516 | case RPC_GSS_SVC_NONE: |
| 1517 | break; |
| 1518 | case RPC_GSS_SVC_INTEGRITY: |
| 1519 | status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); |
| 1520 | if (status) |
| 1521 | goto out; |
| 1522 | break; |
| 1523 | case RPC_GSS_SVC_PRIVACY: |
| 1524 | status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); |
| 1525 | if (status) |
| 1526 | goto out; |
| 1527 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1528 | } |
J. Bruce Fields | 24b2605 | 2005-10-13 16:54:53 -0400 | [diff] [blame] | 1529 | /* take into account extra slack for integrity and privacy cases: */ |
Trond Myklebust | 1be27f3 | 2007-06-27 14:29:04 -0400 | [diff] [blame] | 1530 | 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] | 1531 | + (savedlen - head->iov_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1532 | out_decode: |
Chuck Lever | bf26955 | 2010-12-14 14:59:29 +0000 | [diff] [blame] | 1533 | status = gss_unwrap_req_decode(decode, rqstp, p, obj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1534 | out: |
| 1535 | gss_put_ctx(ctx); |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 1536 | dprintk("RPC: %5u gss_unwrap_resp returning %d\n", task->tk_pid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1537 | status); |
| 1538 | return status; |
| 1539 | } |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 1540 | |
Trond Myklebust | f1c0a86 | 2007-06-23 20:17:58 -0400 | [diff] [blame] | 1541 | static const struct rpc_authops authgss_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1542 | .owner = THIS_MODULE, |
| 1543 | .au_flavor = RPC_AUTH_GSS, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1544 | .au_name = "RPCSEC_GSS", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1545 | .create = gss_create, |
| 1546 | .destroy = gss_destroy, |
| 1547 | .lookup_cred = gss_lookup_cred, |
| 1548 | .crcreate = gss_create_cred |
| 1549 | }; |
| 1550 | |
Trond Myklebust | f1c0a86 | 2007-06-23 20:17:58 -0400 | [diff] [blame] | 1551 | static const struct rpc_credops gss_credops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1552 | .cr_name = "AUTH_GSS", |
| 1553 | .crdestroy = gss_destroy_cred, |
Trond Myklebust | fba3bad | 2006-02-01 12:19:27 -0500 | [diff] [blame] | 1554 | .cr_init = gss_cred_init, |
Trond Myklebust | 5c69104 | 2008-03-12 16:21:07 -0400 | [diff] [blame] | 1555 | .crbind = rpcauth_generic_bind_cred, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1556 | .crmatch = gss_match, |
| 1557 | .crmarshal = gss_marshal, |
| 1558 | .crrefresh = gss_refresh, |
| 1559 | .crvalidate = gss_validate, |
| 1560 | .crwrap_req = gss_wrap_req, |
| 1561 | .crunwrap_resp = gss_unwrap_resp, |
| 1562 | }; |
| 1563 | |
Trond Myklebust | 0df7fb7 | 2007-06-26 17:04:57 -0400 | [diff] [blame] | 1564 | static const struct rpc_credops gss_nullops = { |
| 1565 | .cr_name = "AUTH_GSS", |
Jeff Layton | 6dcd392 | 2008-12-23 15:21:57 -0500 | [diff] [blame] | 1566 | .crdestroy = gss_destroy_nullcred, |
Trond Myklebust | 5c69104 | 2008-03-12 16:21:07 -0400 | [diff] [blame] | 1567 | .crbind = rpcauth_generic_bind_cred, |
Trond Myklebust | 0df7fb7 | 2007-06-26 17:04:57 -0400 | [diff] [blame] | 1568 | .crmatch = gss_match, |
| 1569 | .crmarshal = gss_marshal, |
| 1570 | .crrefresh = gss_refresh_null, |
| 1571 | .crvalidate = gss_validate, |
| 1572 | .crwrap_req = gss_wrap_req, |
| 1573 | .crunwrap_resp = gss_unwrap_resp, |
| 1574 | }; |
| 1575 | |
Trond Myklebust | b693ba4 | 2009-08-09 15:14:15 -0400 | [diff] [blame] | 1576 | static const struct rpc_pipe_ops gss_upcall_ops_v0 = { |
Peng Tao | c122515 | 2011-09-22 21:50:10 -0400 | [diff] [blame] | 1577 | .upcall = rpc_pipe_generic_upcall, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1578 | .downcall = gss_pipe_downcall, |
| 1579 | .destroy_msg = gss_pipe_destroy_msg, |
\"J. Bruce Fields\ | 34769fc | 2008-12-23 16:16:37 -0500 | [diff] [blame] | 1580 | .open_pipe = gss_pipe_open_v0, |
| 1581 | .release_pipe = gss_pipe_release, |
| 1582 | }; |
| 1583 | |
Trond Myklebust | b693ba4 | 2009-08-09 15:14:15 -0400 | [diff] [blame] | 1584 | static const struct rpc_pipe_ops gss_upcall_ops_v1 = { |
Peng Tao | c122515 | 2011-09-22 21:50:10 -0400 | [diff] [blame] | 1585 | .upcall = rpc_pipe_generic_upcall, |
\"J. Bruce Fields\ | 34769fc | 2008-12-23 16:16:37 -0500 | [diff] [blame] | 1586 | .downcall = gss_pipe_downcall, |
| 1587 | .destroy_msg = gss_pipe_destroy_msg, |
| 1588 | .open_pipe = gss_pipe_open_v1, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1589 | .release_pipe = gss_pipe_release, |
| 1590 | }; |
| 1591 | |
| 1592 | /* |
| 1593 | * Initialize RPCSEC_GSS module |
| 1594 | */ |
| 1595 | static int __init init_rpcsec_gss(void) |
| 1596 | { |
| 1597 | int err = 0; |
| 1598 | |
| 1599 | err = rpcauth_register(&authgss_ops); |
| 1600 | if (err) |
| 1601 | goto out; |
| 1602 | err = gss_svc_init(); |
| 1603 | if (err) |
| 1604 | goto out_unregister; |
\"J. Bruce Fields\ | 79a3f20 | 2008-12-23 16:10:52 -0500 | [diff] [blame] | 1605 | rpc_init_wait_queue(&pipe_version_rpc_waitqueue, "gss pipe version"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1606 | return 0; |
| 1607 | out_unregister: |
| 1608 | rpcauth_unregister(&authgss_ops); |
| 1609 | out: |
| 1610 | return err; |
| 1611 | } |
| 1612 | |
| 1613 | static void __exit exit_rpcsec_gss(void) |
| 1614 | { |
| 1615 | gss_svc_shutdown(); |
| 1616 | rpcauth_unregister(&authgss_ops); |
Jesper Dangaard Brouer | bf12691 | 2009-06-08 03:11:48 +0000 | [diff] [blame] | 1617 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1618 | } |
| 1619 | |
| 1620 | MODULE_LICENSE("GPL"); |
Trond Myklebust | 126e216 | 2010-05-13 12:55:38 -0400 | [diff] [blame] | 1621 | module_param_named(expired_cred_retry_delay, |
| 1622 | gss_expired_cred_retry_delay, |
| 1623 | uint, 0644); |
| 1624 | MODULE_PARM_DESC(expired_cred_retry_delay, "Timeout (in seconds) until " |
| 1625 | "the RPC engine retries an expired credential"); |
| 1626 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1627 | module_init(init_rpcsec_gss) |
| 1628 | module_exit(exit_rpcsec_gss) |