Chuck Lever | 2573a46 | 2019-02-11 11:25:15 -0500 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
| 3 | * Neil Brown <neilb@cse.unsw.edu.au> |
| 4 | * J. Bruce Fields <bfields@umich.edu> |
| 5 | * Andy Adamson <andros@umich.edu> |
| 6 | * Dug Song <dugsong@monkey.org> |
| 7 | * |
| 8 | * RPCSEC_GSS server authentication. |
| 9 | * This implements RPCSEC_GSS as defined in rfc2203 (rpcsec_gss) and rfc2078 |
| 10 | * (gssapi) |
| 11 | * |
| 12 | * The RPCSEC_GSS involves three stages: |
| 13 | * 1/ context creation |
| 14 | * 2/ data exchange |
| 15 | * 3/ context destruction |
| 16 | * |
| 17 | * Context creation is handled largely by upcalls to user-space. |
| 18 | * In particular, GSS_Accept_sec_context is handled by an upcall |
| 19 | * Data exchange is handled entirely within the kernel |
| 20 | * In particular, GSS_GetMIC, GSS_VerifyMIC, GSS_Seal, GSS_Unseal are in-kernel. |
| 21 | * Context destruction is handled in-kernel |
| 22 | * GSS_Delete_sec_context is in-kernel |
| 23 | * |
| 24 | * Context creation is initiated by a RPCSEC_GSS_INIT request arriving. |
| 25 | * The context handle and gss_token are used as a key into the rpcsec_init cache. |
| 26 | * The content of this cache includes some of the outputs of GSS_Accept_sec_context, |
| 27 | * being major_status, minor_status, context_handle, reply_token. |
| 28 | * These are sent back to the client. |
| 29 | * Sequence window management is handled by the kernel. The window size if currently |
| 30 | * a compile time constant. |
| 31 | * |
| 32 | * When user-space is happy that a context is established, it places an entry |
| 33 | * in the rpcsec_context cache. The key for this cache is the context_handle. |
| 34 | * The content includes: |
| 35 | * uid/gidlist - for determining access rights |
| 36 | * mechanism type |
| 37 | * mechanism specific information, such as a key |
| 38 | * |
| 39 | */ |
| 40 | |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 41 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | #include <linux/types.h> |
| 43 | #include <linux/module.h> |
| 44 | #include <linux/pagemap.h> |
Eric W. Biederman | ae2975b | 2011-11-14 15:56:38 -0800 | [diff] [blame] | 45 | #include <linux/user_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | |
| 47 | #include <linux/sunrpc/auth_gss.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | #include <linux/sunrpc/gss_err.h> |
| 49 | #include <linux/sunrpc/svcauth.h> |
| 50 | #include <linux/sunrpc/svcauth_gss.h> |
| 51 | #include <linux/sunrpc/cache.h> |
Chuck Lever | ff27e9f | 2019-10-24 09:34:10 -0400 | [diff] [blame] | 52 | |
| 53 | #include <trace/events/rpcgss.h> |
| 54 | |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 55 | #include "gss_rpc_upcall.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
Stanislav Kinsbursky | a1db410 | 2012-01-19 21:42:37 +0400 | [diff] [blame] | 57 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | /* The rpcsec_init cache is used for mapping RPCSEC_GSS_{,CONT_}INIT requests |
| 59 | * into replies. |
| 60 | * |
| 61 | * Key is context handle (\x if empty) and gss_token. |
| 62 | * Content is major_status minor_status (integers) context_handle, reply_token. |
| 63 | * |
| 64 | */ |
| 65 | |
| 66 | static int netobj_equal(struct xdr_netobj *a, struct xdr_netobj *b) |
| 67 | { |
| 68 | return a->len == b->len && 0 == memcmp(a->data, b->data, a->len); |
| 69 | } |
| 70 | |
| 71 | #define RSI_HASHBITS 6 |
| 72 | #define RSI_HASHMAX (1<<RSI_HASHBITS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | |
| 74 | struct rsi { |
| 75 | struct cache_head h; |
| 76 | struct xdr_netobj in_handle, in_token; |
| 77 | struct xdr_netobj out_handle, out_token; |
| 78 | int major_status, minor_status; |
Trond Myklebust | 6d1616b | 2018-10-01 10:41:48 -0400 | [diff] [blame] | 79 | struct rcu_head rcu_head; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | }; |
| 81 | |
Stanislav Kinsbursky | a1db410 | 2012-01-19 21:42:37 +0400 | [diff] [blame] | 82 | static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old); |
| 83 | static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | |
| 85 | static void rsi_free(struct rsi *rsii) |
| 86 | { |
| 87 | kfree(rsii->in_handle.data); |
| 88 | kfree(rsii->in_token.data); |
| 89 | kfree(rsii->out_handle.data); |
| 90 | kfree(rsii->out_token.data); |
| 91 | } |
| 92 | |
Trond Myklebust | 6d1616b | 2018-10-01 10:41:48 -0400 | [diff] [blame] | 93 | static void rsi_free_rcu(struct rcu_head *head) |
| 94 | { |
| 95 | struct rsi *rsii = container_of(head, struct rsi, rcu_head); |
| 96 | |
| 97 | rsi_free(rsii); |
| 98 | kfree(rsii); |
| 99 | } |
| 100 | |
NeilBrown | baab935 | 2006-03-27 01:15:09 -0800 | [diff] [blame] | 101 | static void rsi_put(struct kref *ref) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | { |
NeilBrown | baab935 | 2006-03-27 01:15:09 -0800 | [diff] [blame] | 103 | struct rsi *rsii = container_of(ref, struct rsi, h.ref); |
Trond Myklebust | 6d1616b | 2018-10-01 10:41:48 -0400 | [diff] [blame] | 104 | |
| 105 | call_rcu(&rsii->rcu_head, rsi_free_rcu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | } |
| 107 | |
| 108 | static inline int rsi_hash(struct rsi *item) |
| 109 | { |
| 110 | return hash_mem(item->in_handle.data, item->in_handle.len, RSI_HASHBITS) |
| 111 | ^ hash_mem(item->in_token.data, item->in_token.len, RSI_HASHBITS); |
| 112 | } |
| 113 | |
NeilBrown | d4d11ea | 2006-03-27 01:15:04 -0800 | [diff] [blame] | 114 | static int rsi_match(struct cache_head *a, struct cache_head *b) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | { |
NeilBrown | d4d11ea | 2006-03-27 01:15:04 -0800 | [diff] [blame] | 116 | struct rsi *item = container_of(a, struct rsi, h); |
| 117 | struct rsi *tmp = container_of(b, struct rsi, h); |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 118 | return netobj_equal(&item->in_handle, &tmp->in_handle) && |
| 119 | netobj_equal(&item->in_token, &tmp->in_token); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | } |
| 121 | |
| 122 | static int dup_to_netobj(struct xdr_netobj *dst, char *src, int len) |
| 123 | { |
| 124 | dst->len = len; |
Arnaldo Carvalho de Melo | e69062b | 2006-11-21 01:21:34 -0200 | [diff] [blame] | 125 | dst->data = (len ? kmemdup(src, len, GFP_KERNEL) : NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | if (len && !dst->data) |
| 127 | return -ENOMEM; |
| 128 | return 0; |
| 129 | } |
| 130 | |
| 131 | static inline int dup_netobj(struct xdr_netobj *dst, struct xdr_netobj *src) |
| 132 | { |
| 133 | return dup_to_netobj(dst, src->data, src->len); |
| 134 | } |
| 135 | |
NeilBrown | d4d11ea | 2006-03-27 01:15:04 -0800 | [diff] [blame] | 136 | static void rsi_init(struct cache_head *cnew, struct cache_head *citem) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | { |
NeilBrown | d4d11ea | 2006-03-27 01:15:04 -0800 | [diff] [blame] | 138 | struct rsi *new = container_of(cnew, struct rsi, h); |
| 139 | struct rsi *item = container_of(citem, struct rsi, h); |
| 140 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | new->out_handle.data = NULL; |
| 142 | new->out_handle.len = 0; |
| 143 | new->out_token.data = NULL; |
| 144 | new->out_token.len = 0; |
| 145 | new->in_handle.len = item->in_handle.len; |
| 146 | item->in_handle.len = 0; |
| 147 | new->in_token.len = item->in_token.len; |
| 148 | item->in_token.len = 0; |
| 149 | new->in_handle.data = item->in_handle.data; |
| 150 | item->in_handle.data = NULL; |
| 151 | new->in_token.data = item->in_token.data; |
| 152 | item->in_token.data = NULL; |
| 153 | } |
| 154 | |
NeilBrown | d4d11ea | 2006-03-27 01:15:04 -0800 | [diff] [blame] | 155 | static void update_rsi(struct cache_head *cnew, struct cache_head *citem) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | { |
NeilBrown | d4d11ea | 2006-03-27 01:15:04 -0800 | [diff] [blame] | 157 | struct rsi *new = container_of(cnew, struct rsi, h); |
| 158 | struct rsi *item = container_of(citem, struct rsi, h); |
| 159 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | BUG_ON(new->out_handle.data || new->out_token.data); |
| 161 | new->out_handle.len = item->out_handle.len; |
| 162 | item->out_handle.len = 0; |
| 163 | new->out_token.len = item->out_token.len; |
| 164 | item->out_token.len = 0; |
| 165 | new->out_handle.data = item->out_handle.data; |
| 166 | item->out_handle.data = NULL; |
| 167 | new->out_token.data = item->out_token.data; |
| 168 | item->out_token.data = NULL; |
| 169 | |
| 170 | new->major_status = item->major_status; |
| 171 | new->minor_status = item->minor_status; |
| 172 | } |
| 173 | |
NeilBrown | d4d11ea | 2006-03-27 01:15:04 -0800 | [diff] [blame] | 174 | static struct cache_head *rsi_alloc(void) |
| 175 | { |
| 176 | struct rsi *rsii = kmalloc(sizeof(*rsii), GFP_KERNEL); |
| 177 | if (rsii) |
| 178 | return &rsii->h; |
| 179 | else |
| 180 | return NULL; |
| 181 | } |
| 182 | |
Trond Myklebust | 65286b8 | 2020-03-01 18:21:42 -0500 | [diff] [blame] | 183 | static int rsi_upcall(struct cache_detail *cd, struct cache_head *h) |
| 184 | { |
| 185 | return sunrpc_cache_pipe_upcall_timeout(cd, h); |
| 186 | } |
| 187 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | static void rsi_request(struct cache_detail *cd, |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 189 | struct cache_head *h, |
| 190 | char **bpp, int *blen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | { |
| 192 | struct rsi *rsii = container_of(h, struct rsi, h); |
| 193 | |
| 194 | qword_addhex(bpp, blen, rsii->in_handle.data, rsii->in_handle.len); |
| 195 | qword_addhex(bpp, blen, rsii->in_token.data, rsii->in_token.len); |
| 196 | (*bpp)[-1] = '\n'; |
| 197 | } |
| 198 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | static int rsi_parse(struct cache_detail *cd, |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 200 | char *mesg, int mlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | { |
| 202 | /* context token expiry major minor context token */ |
| 203 | char *buf = mesg; |
| 204 | char *ep; |
| 205 | int len; |
| 206 | struct rsi rsii, *rsip = NULL; |
Arnd Bergmann | f559935 | 2017-10-20 16:34:42 +0200 | [diff] [blame] | 207 | time64_t expiry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | int status = -EINVAL; |
| 209 | |
| 210 | memset(&rsii, 0, sizeof(rsii)); |
| 211 | /* handle */ |
| 212 | len = qword_get(&mesg, buf, mlen); |
| 213 | if (len < 0) |
| 214 | goto out; |
| 215 | status = -ENOMEM; |
| 216 | if (dup_to_netobj(&rsii.in_handle, buf, len)) |
| 217 | goto out; |
| 218 | |
| 219 | /* token */ |
| 220 | len = qword_get(&mesg, buf, mlen); |
| 221 | status = -EINVAL; |
| 222 | if (len < 0) |
| 223 | goto out; |
| 224 | status = -ENOMEM; |
| 225 | if (dup_to_netobj(&rsii.in_token, buf, len)) |
| 226 | goto out; |
| 227 | |
Stanislav Kinsbursky | a1db410 | 2012-01-19 21:42:37 +0400 | [diff] [blame] | 228 | rsip = rsi_lookup(cd, &rsii); |
NeilBrown | d4d11ea | 2006-03-27 01:15:04 -0800 | [diff] [blame] | 229 | if (!rsip) |
| 230 | goto out; |
| 231 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | rsii.h.flags = 0; |
| 233 | /* expiry */ |
| 234 | expiry = get_expiry(&mesg); |
| 235 | status = -EINVAL; |
| 236 | if (expiry == 0) |
| 237 | goto out; |
| 238 | |
| 239 | /* major/minor */ |
| 240 | len = qword_get(&mesg, buf, mlen); |
J. Bruce Fields | b39c18f | 2008-01-06 21:32:37 -0500 | [diff] [blame] | 241 | if (len <= 0) |
| 242 | goto out; |
| 243 | rsii.major_status = simple_strtoul(buf, &ep, 10); |
| 244 | if (*ep) |
| 245 | goto out; |
| 246 | len = qword_get(&mesg, buf, mlen); |
| 247 | if (len <= 0) |
| 248 | goto out; |
| 249 | rsii.minor_status = simple_strtoul(buf, &ep, 10); |
| 250 | if (*ep) |
| 251 | goto out; |
| 252 | |
| 253 | /* out_handle */ |
| 254 | len = qword_get(&mesg, buf, mlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | if (len < 0) |
| 256 | goto out; |
J. Bruce Fields | b39c18f | 2008-01-06 21:32:37 -0500 | [diff] [blame] | 257 | status = -ENOMEM; |
| 258 | if (dup_to_netobj(&rsii.out_handle, buf, len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | |
J. Bruce Fields | b39c18f | 2008-01-06 21:32:37 -0500 | [diff] [blame] | 261 | /* out_token */ |
| 262 | len = qword_get(&mesg, buf, mlen); |
| 263 | status = -EINVAL; |
| 264 | if (len < 0) |
| 265 | goto out; |
| 266 | status = -ENOMEM; |
| 267 | if (dup_to_netobj(&rsii.out_token, buf, len)) |
| 268 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | rsii.h.expiry_time = expiry; |
Stanislav Kinsbursky | a1db410 | 2012-01-19 21:42:37 +0400 | [diff] [blame] | 270 | rsip = rsi_update(cd, &rsii, rsip); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | status = 0; |
| 272 | out: |
| 273 | rsi_free(&rsii); |
| 274 | if (rsip) |
Stanislav Kinsbursky | a1db410 | 2012-01-19 21:42:37 +0400 | [diff] [blame] | 275 | cache_put(&rsip->h, cd); |
NeilBrown | d4d11ea | 2006-03-27 01:15:04 -0800 | [diff] [blame] | 276 | else |
| 277 | status = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | return status; |
| 279 | } |
| 280 | |
Bhumika Goyal | ee24eac | 2017-10-17 18:14:26 +0200 | [diff] [blame] | 281 | static const struct cache_detail rsi_cache_template = { |
Bruce Allan | f35279d | 2005-09-06 15:17:08 -0700 | [diff] [blame] | 282 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | .hash_size = RSI_HASHMAX, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | .name = "auth.rpcsec.init", |
| 285 | .cache_put = rsi_put, |
Trond Myklebust | 65286b8 | 2020-03-01 18:21:42 -0500 | [diff] [blame] | 286 | .cache_upcall = rsi_upcall, |
Stanislav Kinsbursky | 73fb847 | 2013-02-04 14:02:45 +0300 | [diff] [blame] | 287 | .cache_request = rsi_request, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | .cache_parse = rsi_parse, |
NeilBrown | d4d11ea | 2006-03-27 01:15:04 -0800 | [diff] [blame] | 289 | .match = rsi_match, |
| 290 | .init = rsi_init, |
| 291 | .update = update_rsi, |
| 292 | .alloc = rsi_alloc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | }; |
| 294 | |
Stanislav Kinsbursky | a1db410 | 2012-01-19 21:42:37 +0400 | [diff] [blame] | 295 | static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item) |
NeilBrown | d4d11ea | 2006-03-27 01:15:04 -0800 | [diff] [blame] | 296 | { |
| 297 | struct cache_head *ch; |
| 298 | int hash = rsi_hash(item); |
| 299 | |
Trond Myklebust | 6d1616b | 2018-10-01 10:41:48 -0400 | [diff] [blame] | 300 | ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash); |
NeilBrown | d4d11ea | 2006-03-27 01:15:04 -0800 | [diff] [blame] | 301 | if (ch) |
| 302 | return container_of(ch, struct rsi, h); |
| 303 | else |
| 304 | return NULL; |
| 305 | } |
| 306 | |
Stanislav Kinsbursky | a1db410 | 2012-01-19 21:42:37 +0400 | [diff] [blame] | 307 | static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old) |
NeilBrown | d4d11ea | 2006-03-27 01:15:04 -0800 | [diff] [blame] | 308 | { |
| 309 | struct cache_head *ch; |
| 310 | int hash = rsi_hash(new); |
| 311 | |
Stanislav Kinsbursky | a1db410 | 2012-01-19 21:42:37 +0400 | [diff] [blame] | 312 | ch = sunrpc_cache_update(cd, &new->h, |
NeilBrown | d4d11ea | 2006-03-27 01:15:04 -0800 | [diff] [blame] | 313 | &old->h, hash); |
| 314 | if (ch) |
| 315 | return container_of(ch, struct rsi, h); |
| 316 | else |
| 317 | return NULL; |
| 318 | } |
| 319 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | |
| 321 | /* |
| 322 | * The rpcsec_context cache is used to store a context that is |
| 323 | * used in data exchange. |
| 324 | * The key is a context handle. The content is: |
| 325 | * uid, gidlist, mechanism, service-set, mech-specific-data |
| 326 | */ |
| 327 | |
| 328 | #define RSC_HASHBITS 10 |
| 329 | #define RSC_HASHMAX (1<<RSC_HASHBITS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | |
| 331 | #define GSS_SEQ_WIN 128 |
| 332 | |
| 333 | struct gss_svc_seq_data { |
| 334 | /* highest seq number seen so far: */ |
| 335 | int sd_max; |
| 336 | /* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of |
| 337 | * sd_win is nonzero iff sequence number i has been seen already: */ |
| 338 | unsigned long sd_win[GSS_SEQ_WIN/BITS_PER_LONG]; |
| 339 | spinlock_t sd_lock; |
| 340 | }; |
| 341 | |
| 342 | struct rsc { |
| 343 | struct cache_head h; |
| 344 | struct xdr_netobj handle; |
| 345 | struct svc_cred cred; |
| 346 | struct gss_svc_seq_data seqdata; |
| 347 | struct gss_ctx *mechctx; |
Trond Myklebust | 6d1616b | 2018-10-01 10:41:48 -0400 | [diff] [blame] | 348 | struct rcu_head rcu_head; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | }; |
| 350 | |
Stanislav Kinsbursky | a1db410 | 2012-01-19 21:42:37 +0400 | [diff] [blame] | 351 | static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old); |
| 352 | static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | |
| 354 | static void rsc_free(struct rsc *rsci) |
| 355 | { |
| 356 | kfree(rsci->handle.data); |
| 357 | if (rsci->mechctx) |
| 358 | gss_delete_sec_context(&rsci->mechctx); |
J. Bruce Fields | 03a4e1f | 2012-05-14 19:55:22 -0400 | [diff] [blame] | 359 | free_svc_cred(&rsci->cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | } |
| 361 | |
Trond Myklebust | 6d1616b | 2018-10-01 10:41:48 -0400 | [diff] [blame] | 362 | static void rsc_free_rcu(struct rcu_head *head) |
| 363 | { |
| 364 | struct rsc *rsci = container_of(head, struct rsc, rcu_head); |
| 365 | |
| 366 | kfree(rsci->handle.data); |
| 367 | kfree(rsci); |
| 368 | } |
| 369 | |
NeilBrown | baab935 | 2006-03-27 01:15:09 -0800 | [diff] [blame] | 370 | static void rsc_put(struct kref *ref) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | { |
NeilBrown | baab935 | 2006-03-27 01:15:09 -0800 | [diff] [blame] | 372 | struct rsc *rsci = container_of(ref, struct rsc, h.ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | |
Trond Myklebust | 6d1616b | 2018-10-01 10:41:48 -0400 | [diff] [blame] | 374 | if (rsci->mechctx) |
| 375 | gss_delete_sec_context(&rsci->mechctx); |
| 376 | free_svc_cred(&rsci->cred); |
| 377 | call_rcu(&rsci->rcu_head, rsc_free_rcu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | } |
| 379 | |
| 380 | static inline int |
| 381 | rsc_hash(struct rsc *rsci) |
| 382 | { |
| 383 | return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS); |
| 384 | } |
| 385 | |
NeilBrown | 17f834b | 2006-03-27 01:15:05 -0800 | [diff] [blame] | 386 | static int |
| 387 | rsc_match(struct cache_head *a, struct cache_head *b) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | { |
NeilBrown | 17f834b | 2006-03-27 01:15:05 -0800 | [diff] [blame] | 389 | struct rsc *new = container_of(a, struct rsc, h); |
| 390 | struct rsc *tmp = container_of(b, struct rsc, h); |
| 391 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | return netobj_equal(&new->handle, &tmp->handle); |
| 393 | } |
| 394 | |
NeilBrown | 17f834b | 2006-03-27 01:15:05 -0800 | [diff] [blame] | 395 | static void |
| 396 | rsc_init(struct cache_head *cnew, struct cache_head *ctmp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | { |
NeilBrown | 17f834b | 2006-03-27 01:15:05 -0800 | [diff] [blame] | 398 | struct rsc *new = container_of(cnew, struct rsc, h); |
| 399 | struct rsc *tmp = container_of(ctmp, struct rsc, h); |
| 400 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | new->handle.len = tmp->handle.len; |
| 402 | tmp->handle.len = 0; |
| 403 | new->handle.data = tmp->handle.data; |
| 404 | tmp->handle.data = NULL; |
| 405 | new->mechctx = NULL; |
J. Bruce Fields | 4423406 | 2013-05-14 16:53:40 -0400 | [diff] [blame] | 406 | init_svc_cred(&new->cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | } |
| 408 | |
NeilBrown | 17f834b | 2006-03-27 01:15:05 -0800 | [diff] [blame] | 409 | static void |
| 410 | update_rsc(struct cache_head *cnew, struct cache_head *ctmp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | { |
NeilBrown | 17f834b | 2006-03-27 01:15:05 -0800 | [diff] [blame] | 412 | struct rsc *new = container_of(cnew, struct rsc, h); |
| 413 | struct rsc *tmp = container_of(ctmp, struct rsc, h); |
| 414 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | new->mechctx = tmp->mechctx; |
| 416 | tmp->mechctx = NULL; |
| 417 | memset(&new->seqdata, 0, sizeof(new->seqdata)); |
| 418 | spin_lock_init(&new->seqdata.sd_lock); |
| 419 | new->cred = tmp->cred; |
J. Bruce Fields | 4423406 | 2013-05-14 16:53:40 -0400 | [diff] [blame] | 420 | init_svc_cred(&tmp->cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | } |
| 422 | |
NeilBrown | 17f834b | 2006-03-27 01:15:05 -0800 | [diff] [blame] | 423 | static struct cache_head * |
| 424 | rsc_alloc(void) |
| 425 | { |
| 426 | struct rsc *rsci = kmalloc(sizeof(*rsci), GFP_KERNEL); |
| 427 | if (rsci) |
| 428 | return &rsci->h; |
| 429 | else |
| 430 | return NULL; |
| 431 | } |
| 432 | |
Trond Myklebust | 65286b8 | 2020-03-01 18:21:42 -0500 | [diff] [blame] | 433 | static int rsc_upcall(struct cache_detail *cd, struct cache_head *h) |
| 434 | { |
| 435 | return -EINVAL; |
| 436 | } |
| 437 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | static int rsc_parse(struct cache_detail *cd, |
| 439 | char *mesg, int mlen) |
| 440 | { |
| 441 | /* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */ |
| 442 | char *buf = mesg; |
Eric W. Biederman | 683428fae | 2013-02-02 01:40:53 -0800 | [diff] [blame] | 443 | int id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | int len, rv; |
| 445 | struct rsc rsci, *rscp = NULL; |
Arnd Bergmann | 294ec5b | 2018-06-07 17:02:50 +0200 | [diff] [blame] | 446 | time64_t expiry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | int status = -EINVAL; |
J. Bruce Fields | 1df0cad | 2006-06-30 01:56:16 -0700 | [diff] [blame] | 448 | struct gss_api_mech *gm = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | |
| 450 | memset(&rsci, 0, sizeof(rsci)); |
| 451 | /* context handle */ |
| 452 | len = qword_get(&mesg, buf, mlen); |
| 453 | if (len < 0) goto out; |
| 454 | status = -ENOMEM; |
| 455 | if (dup_to_netobj(&rsci.handle, buf, len)) |
| 456 | goto out; |
| 457 | |
| 458 | rsci.h.flags = 0; |
| 459 | /* expiry */ |
| 460 | expiry = get_expiry(&mesg); |
| 461 | status = -EINVAL; |
| 462 | if (expiry == 0) |
| 463 | goto out; |
| 464 | |
Stanislav Kinsbursky | a1db410 | 2012-01-19 21:42:37 +0400 | [diff] [blame] | 465 | rscp = rsc_lookup(cd, &rsci); |
NeilBrown | 17f834b | 2006-03-27 01:15:05 -0800 | [diff] [blame] | 466 | if (!rscp) |
| 467 | goto out; |
| 468 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | /* uid, or NEGATIVE */ |
Eric W. Biederman | 683428fae | 2013-02-02 01:40:53 -0800 | [diff] [blame] | 470 | rv = get_int(&mesg, &id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | if (rv == -EINVAL) |
| 472 | goto out; |
| 473 | if (rv == -ENOENT) |
| 474 | set_bit(CACHE_NEGATIVE, &rsci.h.flags); |
| 475 | else { |
| 476 | int N, i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | |
J. Bruce Fields | 3c34ae1 | 2013-03-04 08:44:01 -0500 | [diff] [blame] | 478 | /* |
| 479 | * NOTE: we skip uid_valid()/gid_valid() checks here: |
| 480 | * instead, * -1 id's are later mapped to the |
| 481 | * (export-specific) anonymous id by nfsd_setuser. |
| 482 | * |
| 483 | * (But supplementary gid's get no such special |
| 484 | * treatment so are checked for validity here.) |
| 485 | */ |
Eric W. Biederman | 683428fae | 2013-02-02 01:40:53 -0800 | [diff] [blame] | 486 | /* uid */ |
Trond Myklebust | e6667c7 | 2019-04-09 12:13:41 -0400 | [diff] [blame] | 487 | rsci.cred.cr_uid = make_kuid(current_user_ns(), id); |
Eric W. Biederman | 683428fae | 2013-02-02 01:40:53 -0800 | [diff] [blame] | 488 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | /* gid */ |
Eric W. Biederman | 683428fae | 2013-02-02 01:40:53 -0800 | [diff] [blame] | 490 | if (get_int(&mesg, &id)) |
| 491 | goto out; |
Trond Myklebust | e6667c7 | 2019-04-09 12:13:41 -0400 | [diff] [blame] | 492 | rsci.cred.cr_gid = make_kgid(current_user_ns(), id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | |
| 494 | /* number of additional gid's */ |
| 495 | if (get_int(&mesg, &N)) |
| 496 | goto out; |
Dan Carpenter | 76cb4be | 2015-02-24 18:34:01 +0300 | [diff] [blame] | 497 | if (N < 0 || N > NGROUPS_MAX) |
| 498 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | status = -ENOMEM; |
| 500 | rsci.cred.cr_group_info = groups_alloc(N); |
| 501 | if (rsci.cred.cr_group_info == NULL) |
| 502 | goto out; |
| 503 | |
| 504 | /* gid's */ |
| 505 | status = -EINVAL; |
| 506 | for (i=0; i<N; i++) { |
Eric W. Biederman | ae2975b | 2011-11-14 15:56:38 -0800 | [diff] [blame] | 507 | kgid_t kgid; |
Eric W. Biederman | 683428fae | 2013-02-02 01:40:53 -0800 | [diff] [blame] | 508 | if (get_int(&mesg, &id)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | goto out; |
Trond Myklebust | e6667c7 | 2019-04-09 12:13:41 -0400 | [diff] [blame] | 510 | kgid = make_kgid(current_user_ns(), id); |
Eric W. Biederman | ae2975b | 2011-11-14 15:56:38 -0800 | [diff] [blame] | 511 | if (!gid_valid(kgid)) |
| 512 | goto out; |
Alexey Dobriyan | 81243ea | 2016-10-07 17:03:12 -0700 | [diff] [blame] | 513 | rsci.cred.cr_group_info->gid[i] = kgid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | } |
Thiago Rafael Becker | bdcf0a4 | 2017-12-14 15:33:12 -0800 | [diff] [blame] | 515 | groups_sort(rsci.cred.cr_group_info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | |
| 517 | /* mech name */ |
| 518 | len = qword_get(&mesg, buf, mlen); |
| 519 | if (len < 0) |
| 520 | goto out; |
J. Bruce Fields | 0dc1531 | 2013-05-14 16:07:13 -0400 | [diff] [blame] | 521 | gm = rsci.cred.cr_gss_mech = gss_mech_get_by_name(buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | status = -EOPNOTSUPP; |
| 523 | if (!gm) |
| 524 | goto out; |
| 525 | |
| 526 | status = -EINVAL; |
| 527 | /* mech-specific data: */ |
| 528 | len = qword_get(&mesg, buf, mlen); |
J. Bruce Fields | 1df0cad | 2006-06-30 01:56:16 -0700 | [diff] [blame] | 529 | if (len < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | goto out; |
Simo Sorce | 400f26b | 2012-05-25 18:09:53 -0400 | [diff] [blame] | 531 | status = gss_import_sec_context(buf, len, gm, &rsci.mechctx, |
| 532 | NULL, GFP_KERNEL); |
J. Bruce Fields | 1df0cad | 2006-06-30 01:56:16 -0700 | [diff] [blame] | 533 | if (status) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | goto out; |
Olga Kornievskaia | 68e76ad | 2008-12-23 16:17:15 -0500 | [diff] [blame] | 535 | |
| 536 | /* get client name */ |
| 537 | len = qword_get(&mesg, buf, mlen); |
| 538 | if (len > 0) { |
J. Bruce Fields | 03a4e1f | 2012-05-14 19:55:22 -0400 | [diff] [blame] | 539 | rsci.cred.cr_principal = kstrdup(buf, GFP_KERNEL); |
Wei Yongjun | 1eb6d62 | 2013-04-18 10:49:09 +0800 | [diff] [blame] | 540 | if (!rsci.cred.cr_principal) { |
| 541 | status = -ENOMEM; |
Olga Kornievskaia | 68e76ad | 2008-12-23 16:17:15 -0500 | [diff] [blame] | 542 | goto out; |
Wei Yongjun | 1eb6d62 | 2013-04-18 10:49:09 +0800 | [diff] [blame] | 543 | } |
Olga Kornievskaia | 68e76ad | 2008-12-23 16:17:15 -0500 | [diff] [blame] | 544 | } |
| 545 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | } |
| 547 | rsci.h.expiry_time = expiry; |
Stanislav Kinsbursky | a1db410 | 2012-01-19 21:42:37 +0400 | [diff] [blame] | 548 | rscp = rsc_update(cd, &rsci, rscp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | status = 0; |
| 550 | out: |
| 551 | rsc_free(&rsci); |
| 552 | if (rscp) |
Stanislav Kinsbursky | a1db410 | 2012-01-19 21:42:37 +0400 | [diff] [blame] | 553 | cache_put(&rscp->h, cd); |
NeilBrown | 17f834b | 2006-03-27 01:15:05 -0800 | [diff] [blame] | 554 | else |
| 555 | status = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | return status; |
| 557 | } |
| 558 | |
Bhumika Goyal | ee24eac | 2017-10-17 18:14:26 +0200 | [diff] [blame] | 559 | static const struct cache_detail rsc_cache_template = { |
Bruce Allan | f35279d | 2005-09-06 15:17:08 -0700 | [diff] [blame] | 560 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | .hash_size = RSC_HASHMAX, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | .name = "auth.rpcsec.context", |
| 563 | .cache_put = rsc_put, |
Trond Myklebust | 65286b8 | 2020-03-01 18:21:42 -0500 | [diff] [blame] | 564 | .cache_upcall = rsc_upcall, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | .cache_parse = rsc_parse, |
NeilBrown | 17f834b | 2006-03-27 01:15:05 -0800 | [diff] [blame] | 566 | .match = rsc_match, |
| 567 | .init = rsc_init, |
| 568 | .update = update_rsc, |
| 569 | .alloc = rsc_alloc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | }; |
| 571 | |
Stanislav Kinsbursky | a1db410 | 2012-01-19 21:42:37 +0400 | [diff] [blame] | 572 | static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item) |
NeilBrown | 17f834b | 2006-03-27 01:15:05 -0800 | [diff] [blame] | 573 | { |
| 574 | struct cache_head *ch; |
| 575 | int hash = rsc_hash(item); |
| 576 | |
Trond Myklebust | 6d1616b | 2018-10-01 10:41:48 -0400 | [diff] [blame] | 577 | ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash); |
NeilBrown | 17f834b | 2006-03-27 01:15:05 -0800 | [diff] [blame] | 578 | if (ch) |
| 579 | return container_of(ch, struct rsc, h); |
| 580 | else |
| 581 | return NULL; |
| 582 | } |
| 583 | |
Stanislav Kinsbursky | a1db410 | 2012-01-19 21:42:37 +0400 | [diff] [blame] | 584 | static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old) |
NeilBrown | 17f834b | 2006-03-27 01:15:05 -0800 | [diff] [blame] | 585 | { |
| 586 | struct cache_head *ch; |
| 587 | int hash = rsc_hash(new); |
| 588 | |
Stanislav Kinsbursky | a1db410 | 2012-01-19 21:42:37 +0400 | [diff] [blame] | 589 | ch = sunrpc_cache_update(cd, &new->h, |
NeilBrown | 17f834b | 2006-03-27 01:15:05 -0800 | [diff] [blame] | 590 | &old->h, hash); |
| 591 | if (ch) |
| 592 | return container_of(ch, struct rsc, h); |
| 593 | else |
| 594 | return NULL; |
| 595 | } |
| 596 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | |
| 598 | static struct rsc * |
Stanislav Kinsbursky | a1db410 | 2012-01-19 21:42:37 +0400 | [diff] [blame] | 599 | gss_svc_searchbyctx(struct cache_detail *cd, struct xdr_netobj *handle) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | { |
| 601 | struct rsc rsci; |
| 602 | struct rsc *found; |
| 603 | |
| 604 | memset(&rsci, 0, sizeof(rsci)); |
Chuck Lever | bf2c4b6 | 2016-09-01 10:50:38 -0400 | [diff] [blame] | 605 | if (dup_to_netobj(&rsci.handle, handle->data, handle->len)) |
| 606 | return NULL; |
Stanislav Kinsbursky | a1db410 | 2012-01-19 21:42:37 +0400 | [diff] [blame] | 607 | found = rsc_lookup(cd, &rsci); |
Chuck Lever | bf2c4b6 | 2016-09-01 10:50:38 -0400 | [diff] [blame] | 608 | rsc_free(&rsci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | if (!found) |
| 610 | return NULL; |
Stanislav Kinsbursky | a1db410 | 2012-01-19 21:42:37 +0400 | [diff] [blame] | 611 | if (cache_check(cd, &found->h, NULL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | return NULL; |
| 613 | return found; |
| 614 | } |
| 615 | |
| 616 | /* Implements sequence number algorithm as specified in RFC 2203. */ |
| 617 | static int |
| 618 | gss_check_seq_num(struct rsc *rsci, int seq_num) |
| 619 | { |
| 620 | struct gss_svc_seq_data *sd = &rsci->seqdata; |
| 621 | |
| 622 | spin_lock(&sd->sd_lock); |
| 623 | if (seq_num > sd->sd_max) { |
| 624 | if (seq_num >= sd->sd_max + GSS_SEQ_WIN) { |
| 625 | memset(sd->sd_win,0,sizeof(sd->sd_win)); |
| 626 | sd->sd_max = seq_num; |
| 627 | } else while (sd->sd_max < seq_num) { |
| 628 | sd->sd_max++; |
| 629 | __clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win); |
| 630 | } |
| 631 | __set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win); |
| 632 | goto ok; |
| 633 | } else if (seq_num <= sd->sd_max - GSS_SEQ_WIN) { |
| 634 | goto drop; |
| 635 | } |
| 636 | /* sd_max - GSS_SEQ_WIN < seq_num <= sd_max */ |
| 637 | if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win)) |
| 638 | goto drop; |
| 639 | ok: |
| 640 | spin_unlock(&sd->sd_lock); |
| 641 | return 1; |
| 642 | drop: |
| 643 | spin_unlock(&sd->sd_lock); |
| 644 | return 0; |
| 645 | } |
| 646 | |
| 647 | static inline u32 round_up_to_quad(u32 i) |
| 648 | { |
| 649 | return (i + 3 ) & ~3; |
| 650 | } |
| 651 | |
| 652 | static inline int |
| 653 | svc_safe_getnetobj(struct kvec *argv, struct xdr_netobj *o) |
| 654 | { |
| 655 | int l; |
| 656 | |
| 657 | if (argv->iov_len < 4) |
| 658 | return -1; |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 659 | o->len = svc_getnl(argv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | l = round_up_to_quad(o->len); |
| 661 | if (argv->iov_len < l) |
| 662 | return -1; |
| 663 | o->data = argv->iov_base; |
| 664 | argv->iov_base += l; |
| 665 | argv->iov_len -= l; |
| 666 | return 0; |
| 667 | } |
| 668 | |
| 669 | static inline int |
| 670 | svc_safe_putnetobj(struct kvec *resv, struct xdr_netobj *o) |
| 671 | { |
Al Viro | 753ed90 | 2006-09-26 22:30:23 -0700 | [diff] [blame] | 672 | u8 *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | |
| 674 | if (resv->iov_len + 4 > PAGE_SIZE) |
| 675 | return -1; |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 676 | svc_putnl(resv, o->len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | p = resv->iov_base + resv->iov_len; |
| 678 | resv->iov_len += round_up_to_quad(o->len); |
| 679 | if (resv->iov_len > PAGE_SIZE) |
| 680 | return -1; |
| 681 | memcpy(p, o->data, o->len); |
Al Viro | 753ed90 | 2006-09-26 22:30:23 -0700 | [diff] [blame] | 682 | memset(p + o->len, 0, round_up_to_quad(o->len) - o->len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | return 0; |
| 684 | } |
| 685 | |
J. Bruce Fields | 21fcd02 | 2007-08-09 20:16:22 -0400 | [diff] [blame] | 686 | /* |
| 687 | * Verify the checksum on the header and return SVC_OK on success. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | * Otherwise, return SVC_DROP (in the case of a bad sequence number) |
| 689 | * or return SVC_DENIED and indicate error in authp. |
| 690 | */ |
| 691 | static int |
| 692 | gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci, |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 693 | __be32 *rpcstart, struct rpc_gss_wire_cred *gc, __be32 *authp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | { |
| 695 | struct gss_ctx *ctx_id = rsci->mechctx; |
| 696 | struct xdr_buf rpchdr; |
| 697 | struct xdr_netobj checksum; |
| 698 | u32 flavor = 0; |
| 699 | struct kvec *argv = &rqstp->rq_arg.head[0]; |
| 700 | struct kvec iov; |
| 701 | |
| 702 | /* data to compute the checksum over: */ |
| 703 | iov.iov_base = rpcstart; |
| 704 | iov.iov_len = (u8 *)argv->iov_base - (u8 *)rpcstart; |
| 705 | xdr_buf_from_iov(&iov, &rpchdr); |
| 706 | |
| 707 | *authp = rpc_autherr_badverf; |
| 708 | if (argv->iov_len < 4) |
| 709 | return SVC_DENIED; |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 710 | flavor = svc_getnl(argv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | if (flavor != RPC_AUTH_GSS) |
| 712 | return SVC_DENIED; |
| 713 | if (svc_safe_getnetobj(argv, &checksum)) |
| 714 | return SVC_DENIED; |
| 715 | |
| 716 | if (rqstp->rq_deferred) /* skip verification of revisited request */ |
| 717 | return SVC_OK; |
J. Bruce Fields | 00fd6e1 | 2005-10-13 16:55:18 -0400 | [diff] [blame] | 718 | if (gss_verify_mic(ctx_id, &rpchdr, &checksum) != GSS_S_COMPLETE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | *authp = rpcsec_gsserr_credproblem; |
| 720 | return SVC_DENIED; |
| 721 | } |
| 722 | |
| 723 | if (gc->gc_seq > MAXSEQ) { |
Chuck Lever | 2815552 | 2020-03-02 15:16:06 -0500 | [diff] [blame] | 724 | trace_rpcgss_svc_large_seqno(rqstp->rq_xid, gc->gc_seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | *authp = rpcsec_gsserr_ctxproblem; |
| 726 | return SVC_DENIED; |
| 727 | } |
| 728 | if (!gss_check_seq_num(rsci, gc->gc_seq)) { |
Chuck Lever | 2815552 | 2020-03-02 15:16:06 -0500 | [diff] [blame] | 729 | trace_rpcgss_svc_old_seqno(rqstp->rq_xid, gc->gc_seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | return SVC_DROP; |
| 731 | } |
| 732 | return SVC_OK; |
| 733 | } |
| 734 | |
| 735 | static int |
Andy Adamson | 822f100 | 2006-01-18 17:43:24 -0800 | [diff] [blame] | 736 | gss_write_null_verf(struct svc_rqst *rqstp) |
| 737 | { |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 738 | __be32 *p; |
Andy Adamson | 822f100 | 2006-01-18 17:43:24 -0800 | [diff] [blame] | 739 | |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 740 | svc_putnl(rqstp->rq_res.head, RPC_AUTH_NULL); |
Andy Adamson | 822f100 | 2006-01-18 17:43:24 -0800 | [diff] [blame] | 741 | p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; |
| 742 | /* don't really need to check if head->iov_len > PAGE_SIZE ... */ |
| 743 | *p++ = 0; |
| 744 | if (!xdr_ressize_check(rqstp, p)) |
| 745 | return -1; |
| 746 | return 0; |
| 747 | } |
| 748 | |
| 749 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq) |
| 751 | { |
J. Bruce Fields | 2876a34 | 2016-10-18 16:30:09 -0400 | [diff] [blame] | 752 | __be32 *xdr_seq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | u32 maj_stat; |
| 754 | struct xdr_buf verf_data; |
| 755 | struct xdr_netobj mic; |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 756 | __be32 *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | struct kvec iov; |
J. Bruce Fields | 2876a34 | 2016-10-18 16:30:09 -0400 | [diff] [blame] | 758 | int err = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 760 | svc_putnl(rqstp->rq_res.head, RPC_AUTH_GSS); |
J. Bruce Fields | 2876a34 | 2016-10-18 16:30:09 -0400 | [diff] [blame] | 761 | xdr_seq = kmalloc(4, GFP_KERNEL); |
| 762 | if (!xdr_seq) |
| 763 | return -1; |
| 764 | *xdr_seq = htonl(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | |
J. Bruce Fields | 2876a34 | 2016-10-18 16:30:09 -0400 | [diff] [blame] | 766 | iov.iov_base = xdr_seq; |
| 767 | iov.iov_len = 4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | xdr_buf_from_iov(&iov, &verf_data); |
| 769 | p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len; |
| 770 | mic.data = (u8 *)(p + 1); |
J. Bruce Fields | 00fd6e1 | 2005-10-13 16:55:18 -0400 | [diff] [blame] | 771 | maj_stat = gss_get_mic(ctx_id, &verf_data, &mic); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | if (maj_stat != GSS_S_COMPLETE) |
J. Bruce Fields | 2876a34 | 2016-10-18 16:30:09 -0400 | [diff] [blame] | 773 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | *p++ = htonl(mic.len); |
| 775 | memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len); |
| 776 | p += XDR_QUADLEN(mic.len); |
| 777 | if (!xdr_ressize_check(rqstp, p)) |
J. Bruce Fields | 2876a34 | 2016-10-18 16:30:09 -0400 | [diff] [blame] | 778 | goto out; |
| 779 | err = 0; |
| 780 | out: |
| 781 | kfree(xdr_seq); |
| 782 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | } |
| 784 | |
| 785 | struct gss_domain { |
| 786 | struct auth_domain h; |
| 787 | u32 pseudoflavor; |
| 788 | }; |
| 789 | |
| 790 | static struct auth_domain * |
| 791 | find_gss_auth_domain(struct gss_ctx *ctx, u32 svc) |
| 792 | { |
| 793 | char *name; |
| 794 | |
| 795 | name = gss_service_to_auth_domain_name(ctx->mech_type, svc); |
| 796 | if (!name) |
| 797 | return NULL; |
| 798 | return auth_domain_find(name); |
| 799 | } |
| 800 | |
NeilBrown | efc36aa | 2006-03-27 01:14:59 -0800 | [diff] [blame] | 801 | static struct auth_ops svcauthops_gss; |
| 802 | |
J. Bruce Fields | 4796f45 | 2007-07-17 04:04:51 -0700 | [diff] [blame] | 803 | u32 svcauth_gss_flavor(struct auth_domain *dom) |
| 804 | { |
| 805 | struct gss_domain *gd = container_of(dom, struct gss_domain, h); |
| 806 | |
| 807 | return gd->pseudoflavor; |
| 808 | } |
| 809 | |
Trond Myklebust | 7bd8826 | 2008-12-23 15:21:32 -0500 | [diff] [blame] | 810 | EXPORT_SYMBOL_GPL(svcauth_gss_flavor); |
J. Bruce Fields | 4796f45 | 2007-07-17 04:04:51 -0700 | [diff] [blame] | 811 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | int |
| 813 | svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name) |
| 814 | { |
| 815 | struct gss_domain *new; |
| 816 | struct auth_domain *test; |
| 817 | int stat = -ENOMEM; |
| 818 | |
| 819 | new = kmalloc(sizeof(*new), GFP_KERNEL); |
| 820 | if (!new) |
| 821 | goto out; |
NeilBrown | efc36aa | 2006-03-27 01:14:59 -0800 | [diff] [blame] | 822 | kref_init(&new->h.ref); |
Arnaldo Carvalho de Melo | e69062b | 2006-11-21 01:21:34 -0200 | [diff] [blame] | 823 | new->h.name = kstrdup(name, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | if (!new->h.name) |
| 825 | goto out_free_dom; |
NeilBrown | efc36aa | 2006-03-27 01:14:59 -0800 | [diff] [blame] | 826 | new->h.flavour = &svcauthops_gss; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | new->pseudoflavor = pseudoflavor; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | |
J. Bruce Fields | cb27680 | 2007-07-23 18:43:52 -0700 | [diff] [blame] | 829 | stat = 0; |
NeilBrown | efc36aa | 2006-03-27 01:14:59 -0800 | [diff] [blame] | 830 | test = auth_domain_lookup(name, &new->h); |
J. Bruce Fields | cb27680 | 2007-07-23 18:43:52 -0700 | [diff] [blame] | 831 | if (test != &new->h) { /* Duplicate registration */ |
| 832 | auth_domain_put(test); |
| 833 | kfree(new->h.name); |
| 834 | goto out_free_dom; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | } |
| 836 | return 0; |
| 837 | |
| 838 | out_free_dom: |
| 839 | kfree(new); |
| 840 | out: |
| 841 | return stat; |
| 842 | } |
| 843 | |
Trond Myklebust | 7bd8826 | 2008-12-23 15:21:32 -0500 | [diff] [blame] | 844 | EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | |
| 846 | static inline int |
| 847 | read_u32_from_xdr_buf(struct xdr_buf *buf, int base, u32 *obj) |
| 848 | { |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 849 | __be32 raw; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | int status; |
| 851 | |
| 852 | status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj)); |
| 853 | if (status) |
| 854 | return status; |
| 855 | *obj = ntohl(raw); |
| 856 | return 0; |
| 857 | } |
| 858 | |
| 859 | /* It would be nice if this bit of code could be shared with the client. |
| 860 | * Obstacles: |
| 861 | * The client shouldn't malloc(), would have to pass in own memory. |
| 862 | * The server uses base of head iovec as read pointer, while the |
| 863 | * client uses separate pointer. */ |
| 864 | static int |
Jeff Layton | 4c190e2 | 2013-02-06 08:28:55 -0500 | [diff] [blame] | 865 | unwrap_integ_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | { |
| 867 | int stat = -EINVAL; |
| 868 | u32 integ_len, maj_stat; |
| 869 | struct xdr_netobj mic; |
| 870 | struct xdr_buf integ_buf; |
| 871 | |
Chuck Lever | 06eb8a5 | 2017-06-19 14:00:40 -0400 | [diff] [blame] | 872 | /* NFS READ normally uses splice to send data in-place. However |
| 873 | * the data in cache can change after the reply's MIC is computed |
| 874 | * but before the RPC reply is sent. To prevent the client from |
| 875 | * rejecting the server-computed MIC in this somewhat rare case, |
| 876 | * do not use splice with the GSS integrity service. |
| 877 | */ |
| 878 | clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags); |
| 879 | |
Jeff Layton | 4c190e2 | 2013-02-06 08:28:55 -0500 | [diff] [blame] | 880 | /* Did we already verify the signature on the original pass through? */ |
| 881 | if (rqstp->rq_deferred) |
| 882 | return 0; |
| 883 | |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 884 | integ_len = svc_getnl(&buf->head[0]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | if (integ_len & 3) |
J.Bruce Fields | b797b5b | 2006-12-13 00:35:19 -0800 | [diff] [blame] | 886 | return stat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | if (integ_len > buf->len) |
J.Bruce Fields | b797b5b | 2006-12-13 00:35:19 -0800 | [diff] [blame] | 888 | return stat; |
J. Bruce Fields | 1754eb2 | 2017-10-24 14:58:11 -0400 | [diff] [blame] | 889 | if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len)) { |
| 890 | WARN_ON_ONCE(1); |
| 891 | return stat; |
| 892 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | /* copy out mic... */ |
| 894 | if (read_u32_from_xdr_buf(buf, integ_len, &mic.len)) |
J. Bruce Fields | 1754eb2 | 2017-10-24 14:58:11 -0400 | [diff] [blame] | 895 | return stat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | if (mic.len > RPC_MAX_AUTH_SIZE) |
J.Bruce Fields | b797b5b | 2006-12-13 00:35:19 -0800 | [diff] [blame] | 897 | return stat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | mic.data = kmalloc(mic.len, GFP_KERNEL); |
| 899 | if (!mic.data) |
J.Bruce Fields | b797b5b | 2006-12-13 00:35:19 -0800 | [diff] [blame] | 900 | return stat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | if (read_bytes_from_xdr_buf(buf, integ_len + 4, mic.data, mic.len)) |
| 902 | goto out; |
J. Bruce Fields | 00fd6e1 | 2005-10-13 16:55:18 -0400 | [diff] [blame] | 903 | maj_stat = gss_verify_mic(ctx, &integ_buf, &mic); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | if (maj_stat != GSS_S_COMPLETE) |
| 905 | goto out; |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 906 | if (svc_getnl(&buf->head[0]) != seq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | goto out; |
Tomáš Trnka | c0cb8bf | 2016-05-20 16:41:10 +0200 | [diff] [blame] | 908 | /* trim off the mic and padding at the end before returning */ |
Chuck Lever | 241b1f4 | 2019-02-11 11:25:09 -0500 | [diff] [blame] | 909 | buf->len -= 4 + round_up_to_quad(mic.len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 910 | stat = 0; |
| 911 | out: |
J.Bruce Fields | b797b5b | 2006-12-13 00:35:19 -0800 | [diff] [blame] | 912 | kfree(mic.data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | return stat; |
| 914 | } |
| 915 | |
J. Bruce Fields | 7c9fdcf | 2006-06-30 01:56:19 -0700 | [diff] [blame] | 916 | static inline int |
| 917 | total_buf_len(struct xdr_buf *buf) |
| 918 | { |
| 919 | return buf->head[0].iov_len + buf->page_len + buf->tail[0].iov_len; |
| 920 | } |
| 921 | |
| 922 | static void |
| 923 | fix_priv_head(struct xdr_buf *buf, int pad) |
| 924 | { |
| 925 | if (buf->page_len == 0) { |
| 926 | /* We need to adjust head and buf->len in tandem in this |
| 927 | * case to make svc_defer() work--it finds the original |
| 928 | * buffer start using buf->len - buf->head[0].iov_len. */ |
| 929 | buf->head[0].iov_len -= pad; |
| 930 | } |
| 931 | } |
| 932 | |
| 933 | static int |
| 934 | unwrap_priv_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx) |
| 935 | { |
| 936 | u32 priv_len, maj_stat; |
| 937 | int pad, saved_len, remaining_len, offset; |
| 938 | |
Jeff Layton | 779fb0f | 2014-11-19 07:51:18 -0500 | [diff] [blame] | 939 | clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags); |
J. Bruce Fields | 7c9fdcf | 2006-06-30 01:56:19 -0700 | [diff] [blame] | 940 | |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 941 | priv_len = svc_getnl(&buf->head[0]); |
J. Bruce Fields | 7c9fdcf | 2006-06-30 01:56:19 -0700 | [diff] [blame] | 942 | if (rqstp->rq_deferred) { |
| 943 | /* Already decrypted last time through! The sequence number |
| 944 | * check at out_seq is unnecessary but harmless: */ |
| 945 | goto out_seq; |
| 946 | } |
| 947 | /* buf->len is the number of bytes from the original start of the |
| 948 | * request to the end, where head[0].iov_len is just the bytes |
| 949 | * not yet read from the head, so these two values are different: */ |
| 950 | remaining_len = total_buf_len(buf); |
| 951 | if (priv_len > remaining_len) |
| 952 | return -EINVAL; |
| 953 | pad = remaining_len - priv_len; |
| 954 | buf->len -= pad; |
| 955 | fix_priv_head(buf, pad); |
| 956 | |
| 957 | /* Maybe it would be better to give gss_unwrap a length parameter: */ |
| 958 | saved_len = buf->len; |
| 959 | buf->len = priv_len; |
| 960 | maj_stat = gss_unwrap(ctx, 0, buf); |
| 961 | pad = priv_len - buf->len; |
| 962 | buf->len = saved_len; |
| 963 | buf->len -= pad; |
| 964 | /* The upper layers assume the buffer is aligned on 4-byte boundaries. |
| 965 | * In the krb5p case, at least, the data ends up offset, so we need to |
| 966 | * move it around. */ |
| 967 | /* XXX: This is very inefficient. It would be better to either do |
| 968 | * this while we encrypt, or maybe in the receive code, if we can peak |
| 969 | * ahead and work out the service and mechanism there. */ |
Chuck Lever | 96f194b | 2020-03-02 15:01:08 -0500 | [diff] [blame] | 970 | offset = xdr_pad_size(buf->head[0].iov_len); |
J. Bruce Fields | 7c9fdcf | 2006-06-30 01:56:19 -0700 | [diff] [blame] | 971 | if (offset) { |
| 972 | buf->buflen = RPCSVC_MAXPAYLOAD; |
| 973 | xdr_shift_buf(buf, offset); |
| 974 | fix_priv_head(buf, pad); |
| 975 | } |
| 976 | if (maj_stat != GSS_S_COMPLETE) |
| 977 | return -EINVAL; |
| 978 | out_seq: |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 979 | if (svc_getnl(&buf->head[0]) != seq) |
J. Bruce Fields | 7c9fdcf | 2006-06-30 01:56:19 -0700 | [diff] [blame] | 980 | return -EINVAL; |
| 981 | return 0; |
| 982 | } |
| 983 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | struct gss_svc_data { |
| 985 | /* decoded gss client cred: */ |
| 986 | struct rpc_gss_wire_cred clcred; |
J.Bruce Fields | 5b304bc | 2006-10-04 02:16:07 -0700 | [diff] [blame] | 987 | /* save a pointer to the beginning of the encoded verifier, |
| 988 | * for use in encryption/checksumming in svcauth_gss_release: */ |
| 989 | __be32 *verf_start; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | struct rsc *rsci; |
| 991 | }; |
| 992 | |
| 993 | static int |
| 994 | svcauth_gss_set_client(struct svc_rqst *rqstp) |
| 995 | { |
| 996 | struct gss_svc_data *svcdata = rqstp->rq_auth_data; |
| 997 | struct rsc *rsci = svcdata->rsci; |
| 998 | struct rpc_gss_wire_cred *gc = &svcdata->clcred; |
J. Bruce Fields | 3ab4d8b | 2007-07-17 04:04:46 -0700 | [diff] [blame] | 999 | int stat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | |
J. Bruce Fields | 3ab4d8b | 2007-07-17 04:04:46 -0700 | [diff] [blame] | 1001 | /* |
| 1002 | * A gss export can be specified either by: |
| 1003 | * export *(sec=krb5,rw) |
| 1004 | * or by |
| 1005 | * export gss/krb5(rw) |
| 1006 | * The latter is deprecated; but for backwards compatibility reasons |
| 1007 | * the nfsd code will still fall back on trying it if the former |
| 1008 | * doesn't work; so we try to make both available to nfsd, below. |
| 1009 | */ |
| 1010 | rqstp->rq_gssclient = find_gss_auth_domain(rsci->mechctx, gc->gc_svc); |
| 1011 | if (rqstp->rq_gssclient == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1012 | return SVC_DENIED; |
J. Bruce Fields | 3ab4d8b | 2007-07-17 04:04:46 -0700 | [diff] [blame] | 1013 | stat = svcauth_unix_set_client(rqstp); |
NeilBrown | 1ebede8 | 2010-08-12 17:04:07 +1000 | [diff] [blame] | 1014 | if (stat == SVC_DROP || stat == SVC_CLOSE) |
J. Bruce Fields | 3ab4d8b | 2007-07-17 04:04:46 -0700 | [diff] [blame] | 1015 | return stat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1016 | return SVC_OK; |
| 1017 | } |
| 1018 | |
Kevin Coffman | 91a4762 | 2006-01-18 17:43:25 -0800 | [diff] [blame] | 1019 | static inline int |
Simo Sorce | fc2952a | 2012-04-17 09:39:06 -0400 | [diff] [blame] | 1020 | gss_write_init_verf(struct cache_detail *cd, struct svc_rqst *rqstp, |
| 1021 | struct xdr_netobj *out_handle, int *major_status) |
Kevin Coffman | 91a4762 | 2006-01-18 17:43:25 -0800 | [diff] [blame] | 1022 | { |
| 1023 | struct rsc *rsci; |
Frank Filz | 54f9247 | 2007-05-09 02:34:53 -0700 | [diff] [blame] | 1024 | int rc; |
Kevin Coffman | 91a4762 | 2006-01-18 17:43:25 -0800 | [diff] [blame] | 1025 | |
Simo Sorce | fc2952a | 2012-04-17 09:39:06 -0400 | [diff] [blame] | 1026 | if (*major_status != GSS_S_COMPLETE) |
Kevin Coffman | 91a4762 | 2006-01-18 17:43:25 -0800 | [diff] [blame] | 1027 | return gss_write_null_verf(rqstp); |
Simo Sorce | fc2952a | 2012-04-17 09:39:06 -0400 | [diff] [blame] | 1028 | rsci = gss_svc_searchbyctx(cd, out_handle); |
Kevin Coffman | 91a4762 | 2006-01-18 17:43:25 -0800 | [diff] [blame] | 1029 | if (rsci == NULL) { |
Simo Sorce | fc2952a | 2012-04-17 09:39:06 -0400 | [diff] [blame] | 1030 | *major_status = GSS_S_NO_CONTEXT; |
Kevin Coffman | 91a4762 | 2006-01-18 17:43:25 -0800 | [diff] [blame] | 1031 | return gss_write_null_verf(rqstp); |
| 1032 | } |
Frank Filz | 54f9247 | 2007-05-09 02:34:53 -0700 | [diff] [blame] | 1033 | rc = gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN); |
Stanislav Kinsbursky | a1db410 | 2012-01-19 21:42:37 +0400 | [diff] [blame] | 1034 | cache_put(&rsci->h, cd); |
Frank Filz | 54f9247 | 2007-05-09 02:34:53 -0700 | [diff] [blame] | 1035 | return rc; |
Kevin Coffman | 91a4762 | 2006-01-18 17:43:25 -0800 | [diff] [blame] | 1036 | } |
| 1037 | |
Simo Sorce | fc2952a | 2012-04-17 09:39:06 -0400 | [diff] [blame] | 1038 | static inline int |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1039 | gss_read_common_verf(struct rpc_gss_wire_cred *gc, |
| 1040 | struct kvec *argv, __be32 *authp, |
| 1041 | struct xdr_netobj *in_handle) |
Simo Sorce | fc2952a | 2012-04-17 09:39:06 -0400 | [diff] [blame] | 1042 | { |
Simo Sorce | fc2952a | 2012-04-17 09:39:06 -0400 | [diff] [blame] | 1043 | /* Read the verifier; should be NULL: */ |
| 1044 | *authp = rpc_autherr_badverf; |
| 1045 | if (argv->iov_len < 2 * 4) |
| 1046 | return SVC_DENIED; |
| 1047 | if (svc_getnl(argv) != RPC_AUTH_NULL) |
| 1048 | return SVC_DENIED; |
| 1049 | if (svc_getnl(argv) != 0) |
| 1050 | return SVC_DENIED; |
| 1051 | /* Martial context handle and token for upcall: */ |
| 1052 | *authp = rpc_autherr_badcred; |
| 1053 | if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0) |
| 1054 | return SVC_DENIED; |
| 1055 | if (dup_netobj(in_handle, &gc->gc_ctx)) |
| 1056 | return SVC_CLOSE; |
| 1057 | *authp = rpc_autherr_badverf; |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1058 | |
| 1059 | return 0; |
| 1060 | } |
| 1061 | |
| 1062 | static inline int |
| 1063 | gss_read_verf(struct rpc_gss_wire_cred *gc, |
| 1064 | struct kvec *argv, __be32 *authp, |
| 1065 | struct xdr_netobj *in_handle, |
| 1066 | struct xdr_netobj *in_token) |
| 1067 | { |
| 1068 | struct xdr_netobj tmpobj; |
| 1069 | int res; |
| 1070 | |
| 1071 | res = gss_read_common_verf(gc, argv, authp, in_handle); |
| 1072 | if (res) |
| 1073 | return res; |
| 1074 | |
Simo Sorce | fc2952a | 2012-04-17 09:39:06 -0400 | [diff] [blame] | 1075 | if (svc_safe_getnetobj(argv, &tmpobj)) { |
| 1076 | kfree(in_handle->data); |
| 1077 | return SVC_DENIED; |
| 1078 | } |
| 1079 | if (dup_netobj(in_token, &tmpobj)) { |
| 1080 | kfree(in_handle->data); |
| 1081 | return SVC_CLOSE; |
| 1082 | } |
| 1083 | |
| 1084 | return 0; |
| 1085 | } |
| 1086 | |
Chuck Lever | 5866efa | 2019-10-24 09:34:16 -0400 | [diff] [blame] | 1087 | static void gss_free_in_token_pages(struct gssp_in_token *in_token) |
| 1088 | { |
| 1089 | u32 inlen; |
| 1090 | int i; |
| 1091 | |
| 1092 | i = 0; |
| 1093 | inlen = in_token->page_len; |
| 1094 | while (inlen) { |
| 1095 | if (in_token->pages[i]) |
| 1096 | put_page(in_token->pages[i]); |
| 1097 | inlen -= inlen > PAGE_SIZE ? PAGE_SIZE : inlen; |
| 1098 | } |
| 1099 | |
| 1100 | kfree(in_token->pages); |
| 1101 | in_token->pages = NULL; |
| 1102 | } |
| 1103 | |
| 1104 | static int gss_read_proxy_verf(struct svc_rqst *rqstp, |
| 1105 | struct rpc_gss_wire_cred *gc, __be32 *authp, |
| 1106 | struct xdr_netobj *in_handle, |
| 1107 | struct gssp_in_token *in_token) |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1108 | { |
| 1109 | struct kvec *argv = &rqstp->rq_arg.head[0]; |
Chuck Lever | 5866efa | 2019-10-24 09:34:16 -0400 | [diff] [blame] | 1110 | unsigned int page_base, length; |
| 1111 | int pages, i, res; |
| 1112 | size_t inlen; |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1113 | |
| 1114 | res = gss_read_common_verf(gc, argv, authp, in_handle); |
| 1115 | if (res) |
| 1116 | return res; |
| 1117 | |
| 1118 | inlen = svc_getnl(argv); |
| 1119 | if (inlen > (argv->iov_len + rqstp->rq_arg.page_len)) |
| 1120 | return SVC_DENIED; |
| 1121 | |
Chuck Lever | 5866efa | 2019-10-24 09:34:16 -0400 | [diff] [blame] | 1122 | pages = DIV_ROUND_UP(inlen, PAGE_SIZE); |
| 1123 | in_token->pages = kcalloc(pages, sizeof(struct page *), GFP_KERNEL); |
| 1124 | if (!in_token->pages) |
| 1125 | return SVC_DENIED; |
| 1126 | in_token->page_base = 0; |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1127 | in_token->page_len = inlen; |
Chuck Lever | 5866efa | 2019-10-24 09:34:16 -0400 | [diff] [blame] | 1128 | for (i = 0; i < pages; i++) { |
| 1129 | in_token->pages[i] = alloc_page(GFP_KERNEL); |
| 1130 | if (!in_token->pages[i]) { |
| 1131 | gss_free_in_token_pages(in_token); |
| 1132 | return SVC_DENIED; |
| 1133 | } |
| 1134 | } |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1135 | |
Chuck Lever | 5866efa | 2019-10-24 09:34:16 -0400 | [diff] [blame] | 1136 | length = min_t(unsigned int, inlen, argv->iov_len); |
| 1137 | memcpy(page_address(in_token->pages[0]), argv->iov_base, length); |
| 1138 | inlen -= length; |
| 1139 | |
| 1140 | i = 1; |
| 1141 | page_base = rqstp->rq_arg.page_base; |
| 1142 | while (inlen) { |
| 1143 | length = min_t(unsigned int, inlen, PAGE_SIZE); |
| 1144 | memcpy(page_address(in_token->pages[i]), |
| 1145 | page_address(rqstp->rq_arg.pages[i]) + page_base, |
| 1146 | length); |
| 1147 | |
| 1148 | inlen -= length; |
| 1149 | page_base = 0; |
| 1150 | i++; |
| 1151 | } |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1152 | return 0; |
| 1153 | } |
| 1154 | |
Simo Sorce | fc2952a | 2012-04-17 09:39:06 -0400 | [diff] [blame] | 1155 | static inline int |
| 1156 | gss_write_resv(struct kvec *resv, size_t size_limit, |
| 1157 | struct xdr_netobj *out_handle, struct xdr_netobj *out_token, |
| 1158 | int major_status, int minor_status) |
| 1159 | { |
| 1160 | if (resv->iov_len + 4 > size_limit) |
| 1161 | return -1; |
| 1162 | svc_putnl(resv, RPC_SUCCESS); |
| 1163 | if (svc_safe_putnetobj(resv, out_handle)) |
| 1164 | return -1; |
| 1165 | if (resv->iov_len + 3 * 4 > size_limit) |
| 1166 | return -1; |
| 1167 | svc_putnl(resv, major_status); |
| 1168 | svc_putnl(resv, minor_status); |
| 1169 | svc_putnl(resv, GSS_SEQ_WIN); |
| 1170 | if (svc_safe_putnetobj(resv, out_token)) |
| 1171 | return -1; |
| 1172 | return 0; |
| 1173 | } |
| 1174 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1175 | /* |
J. Bruce Fields | 21fcd02 | 2007-08-09 20:16:22 -0400 | [diff] [blame] | 1176 | * Having read the cred already and found we're in the context |
| 1177 | * initiation case, read the verifier and initiate (or check the results |
| 1178 | * of) upcalls to userspace for help with context initiation. If |
| 1179 | * the upcall results are available, write the verifier and result. |
| 1180 | * Otherwise, drop the request pending an answer to the upcall. |
| 1181 | */ |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1182 | static int svcauth_gss_legacy_init(struct svc_rqst *rqstp, |
J. Bruce Fields | 21fcd02 | 2007-08-09 20:16:22 -0400 | [diff] [blame] | 1183 | struct rpc_gss_wire_cred *gc, __be32 *authp) |
| 1184 | { |
| 1185 | struct kvec *argv = &rqstp->rq_arg.head[0]; |
| 1186 | struct kvec *resv = &rqstp->rq_res.head[0]; |
J. Bruce Fields | 21fcd02 | 2007-08-09 20:16:22 -0400 | [diff] [blame] | 1187 | struct rsi *rsip, rsikey; |
J. Bruce Fields | 980e5a4 | 2007-12-12 18:21:17 -0500 | [diff] [blame] | 1188 | int ret; |
Vasily Averin | b8be567 | 2018-12-24 14:44:42 +0300 | [diff] [blame] | 1189 | struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id); |
J. Bruce Fields | 21fcd02 | 2007-08-09 20:16:22 -0400 | [diff] [blame] | 1190 | |
J. Bruce Fields | 21fcd02 | 2007-08-09 20:16:22 -0400 | [diff] [blame] | 1191 | memset(&rsikey, 0, sizeof(rsikey)); |
Simo Sorce | fc2952a | 2012-04-17 09:39:06 -0400 | [diff] [blame] | 1192 | ret = gss_read_verf(gc, argv, authp, |
| 1193 | &rsikey.in_handle, &rsikey.in_token); |
| 1194 | if (ret) |
| 1195 | return ret; |
J. Bruce Fields | 21fcd02 | 2007-08-09 20:16:22 -0400 | [diff] [blame] | 1196 | |
| 1197 | /* Perform upcall, or find upcall result: */ |
Stanislav Kinsbursky | a1db410 | 2012-01-19 21:42:37 +0400 | [diff] [blame] | 1198 | rsip = rsi_lookup(sn->rsi_cache, &rsikey); |
J. Bruce Fields | 21fcd02 | 2007-08-09 20:16:22 -0400 | [diff] [blame] | 1199 | rsi_free(&rsikey); |
| 1200 | if (!rsip) |
NeilBrown | 1ebede8 | 2010-08-12 17:04:07 +1000 | [diff] [blame] | 1201 | return SVC_CLOSE; |
Stanislav Kinsbursky | a1db410 | 2012-01-19 21:42:37 +0400 | [diff] [blame] | 1202 | if (cache_check(sn->rsi_cache, &rsip->h, &rqstp->rq_chandle) < 0) |
J. Bruce Fields | 21fcd02 | 2007-08-09 20:16:22 -0400 | [diff] [blame] | 1203 | /* No upcall result: */ |
NeilBrown | 1ebede8 | 2010-08-12 17:04:07 +1000 | [diff] [blame] | 1204 | return SVC_CLOSE; |
NeilBrown | 2ed5282 | 2010-08-12 17:04:07 +1000 | [diff] [blame] | 1205 | |
| 1206 | ret = SVC_CLOSE; |
| 1207 | /* Got an answer to the upcall; use it: */ |
Simo Sorce | fc2952a | 2012-04-17 09:39:06 -0400 | [diff] [blame] | 1208 | if (gss_write_init_verf(sn->rsc_cache, rqstp, |
| 1209 | &rsip->out_handle, &rsip->major_status)) |
NeilBrown | 2ed5282 | 2010-08-12 17:04:07 +1000 | [diff] [blame] | 1210 | goto out; |
Simo Sorce | fc2952a | 2012-04-17 09:39:06 -0400 | [diff] [blame] | 1211 | if (gss_write_resv(resv, PAGE_SIZE, |
| 1212 | &rsip->out_handle, &rsip->out_token, |
| 1213 | rsip->major_status, rsip->minor_status)) |
NeilBrown | 2ed5282 | 2010-08-12 17:04:07 +1000 | [diff] [blame] | 1214 | goto out; |
| 1215 | |
J. Bruce Fields | 980e5a4 | 2007-12-12 18:21:17 -0500 | [diff] [blame] | 1216 | ret = SVC_COMPLETE; |
| 1217 | out: |
Stanislav Kinsbursky | a1db410 | 2012-01-19 21:42:37 +0400 | [diff] [blame] | 1218 | cache_put(&rsip->h, sn->rsi_cache); |
J. Bruce Fields | 980e5a4 | 2007-12-12 18:21:17 -0500 | [diff] [blame] | 1219 | return ret; |
J. Bruce Fields | 21fcd02 | 2007-08-09 20:16:22 -0400 | [diff] [blame] | 1220 | } |
| 1221 | |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1222 | static int gss_proxy_save_rsc(struct cache_detail *cd, |
| 1223 | struct gssp_upcall_data *ud, |
| 1224 | uint64_t *handle) |
| 1225 | { |
| 1226 | struct rsc rsci, *rscp = NULL; |
| 1227 | static atomic64_t ctxhctr; |
| 1228 | long long ctxh; |
| 1229 | struct gss_api_mech *gm = NULL; |
Arnd Bergmann | 294ec5b | 2018-06-07 17:02:50 +0200 | [diff] [blame] | 1230 | time64_t expiry; |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1231 | int status = -EINVAL; |
| 1232 | |
| 1233 | memset(&rsci, 0, sizeof(rsci)); |
| 1234 | /* context handle */ |
| 1235 | status = -ENOMEM; |
| 1236 | /* the handle needs to be just a unique id, |
| 1237 | * use a static counter */ |
| 1238 | ctxh = atomic64_inc_return(&ctxhctr); |
| 1239 | |
| 1240 | /* make a copy for the caller */ |
| 1241 | *handle = ctxh; |
| 1242 | |
| 1243 | /* make a copy for the rsc cache */ |
| 1244 | if (dup_to_netobj(&rsci.handle, (char *)handle, sizeof(uint64_t))) |
| 1245 | goto out; |
| 1246 | rscp = rsc_lookup(cd, &rsci); |
| 1247 | if (!rscp) |
| 1248 | goto out; |
| 1249 | |
| 1250 | /* creds */ |
| 1251 | if (!ud->found_creds) { |
| 1252 | /* userspace seem buggy, we should always get at least a |
| 1253 | * mapping to nobody */ |
J. Bruce Fields | 3be3455 | 2013-10-08 15:53:07 -0400 | [diff] [blame] | 1254 | goto out; |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1255 | } else { |
Roberto Bergantinos Corpas | 3d96208 | 2020-02-04 11:32:56 +0100 | [diff] [blame] | 1256 | struct timespec64 boot; |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1257 | |
| 1258 | /* steal creds */ |
| 1259 | rsci.cred = ud->creds; |
| 1260 | memset(&ud->creds, 0, sizeof(struct svc_cred)); |
| 1261 | |
| 1262 | status = -EOPNOTSUPP; |
| 1263 | /* get mech handle from OID */ |
| 1264 | gm = gss_mech_get_by_OID(&ud->mech_oid); |
| 1265 | if (!gm) |
| 1266 | goto out; |
J. Bruce Fields | 7193bd1 | 2013-07-31 17:51:42 -0400 | [diff] [blame] | 1267 | rsci.cred.cr_gss_mech = gm; |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1268 | |
| 1269 | status = -EINVAL; |
| 1270 | /* mech-specific data: */ |
| 1271 | status = gss_import_sec_context(ud->out_handle.data, |
| 1272 | ud->out_handle.len, |
| 1273 | gm, &rsci.mechctx, |
| 1274 | &expiry, GFP_KERNEL); |
| 1275 | if (status) |
| 1276 | goto out; |
Roberto Bergantinos Corpas | 3d96208 | 2020-02-04 11:32:56 +0100 | [diff] [blame] | 1277 | |
| 1278 | getboottime64(&boot); |
| 1279 | expiry -= boot.tv_sec; |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1280 | } |
| 1281 | |
| 1282 | rsci.h.expiry_time = expiry; |
| 1283 | rscp = rsc_update(cd, &rsci, rscp); |
| 1284 | status = 0; |
| 1285 | out: |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1286 | rsc_free(&rsci); |
| 1287 | if (rscp) |
| 1288 | cache_put(&rscp->h, cd); |
| 1289 | else |
| 1290 | status = -ENOMEM; |
| 1291 | return status; |
| 1292 | } |
| 1293 | |
| 1294 | static int svcauth_gss_proxy_init(struct svc_rqst *rqstp, |
| 1295 | struct rpc_gss_wire_cred *gc, __be32 *authp) |
| 1296 | { |
| 1297 | struct kvec *resv = &rqstp->rq_res.head[0]; |
| 1298 | struct xdr_netobj cli_handle; |
| 1299 | struct gssp_upcall_data ud; |
| 1300 | uint64_t handle; |
| 1301 | int status; |
| 1302 | int ret; |
Vasily Averin | b8be567 | 2018-12-24 14:44:42 +0300 | [diff] [blame] | 1303 | struct net *net = SVC_NET(rqstp); |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1304 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
| 1305 | |
| 1306 | memset(&ud, 0, sizeof(ud)); |
| 1307 | ret = gss_read_proxy_verf(rqstp, gc, authp, |
| 1308 | &ud.in_handle, &ud.in_token); |
| 1309 | if (ret) |
| 1310 | return ret; |
| 1311 | |
| 1312 | ret = SVC_CLOSE; |
| 1313 | |
| 1314 | /* Perform synchronous upcall to gss-proxy */ |
| 1315 | status = gssp_accept_sec_context_upcall(net, &ud); |
| 1316 | if (status) |
| 1317 | goto out; |
| 1318 | |
Chuck Lever | 2815552 | 2020-03-02 15:16:06 -0500 | [diff] [blame] | 1319 | trace_rpcgss_svc_accept_upcall(rqstp->rq_xid, ud.major_status, |
| 1320 | ud.minor_status); |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1321 | |
| 1322 | switch (ud.major_status) { |
| 1323 | case GSS_S_CONTINUE_NEEDED: |
| 1324 | cli_handle = ud.out_handle; |
| 1325 | break; |
| 1326 | case GSS_S_COMPLETE: |
| 1327 | status = gss_proxy_save_rsc(sn->rsc_cache, &ud, &handle); |
Chuck Lever | 2815552 | 2020-03-02 15:16:06 -0500 | [diff] [blame] | 1328 | if (status) |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1329 | goto out; |
| 1330 | cli_handle.data = (u8 *)&handle; |
| 1331 | cli_handle.len = sizeof(handle); |
| 1332 | break; |
| 1333 | default: |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1334 | goto out; |
| 1335 | } |
| 1336 | |
| 1337 | /* Got an answer to the upcall; use it: */ |
| 1338 | if (gss_write_init_verf(sn->rsc_cache, rqstp, |
Chuck Lever | 2815552 | 2020-03-02 15:16:06 -0500 | [diff] [blame] | 1339 | &cli_handle, &ud.major_status)) |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1340 | goto out; |
| 1341 | if (gss_write_resv(resv, PAGE_SIZE, |
| 1342 | &cli_handle, &ud.out_token, |
Chuck Lever | 2815552 | 2020-03-02 15:16:06 -0500 | [diff] [blame] | 1343 | ud.major_status, ud.minor_status)) |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1344 | goto out; |
| 1345 | |
| 1346 | ret = SVC_COMPLETE; |
| 1347 | out: |
Chuck Lever | 5866efa | 2019-10-24 09:34:16 -0400 | [diff] [blame] | 1348 | gss_free_in_token_pages(&ud.in_token); |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1349 | gssp_free_upcall_data(&ud); |
| 1350 | return ret; |
| 1351 | } |
| 1352 | |
Jeff Layton | 0fdc267 | 2014-01-04 07:18:05 -0500 | [diff] [blame] | 1353 | /* |
| 1354 | * Try to set the sn->use_gss_proxy variable to a new value. We only allow |
| 1355 | * it to be changed if it's currently undefined (-1). If it's any other value |
| 1356 | * then return -EBUSY unless the type wouldn't have changed anyway. |
| 1357 | */ |
| 1358 | static int set_gss_proxy(struct net *net, int type) |
| 1359 | { |
| 1360 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
| 1361 | int ret; |
| 1362 | |
| 1363 | WARN_ON_ONCE(type != 0 && type != 1); |
| 1364 | ret = cmpxchg(&sn->use_gss_proxy, -1, type); |
| 1365 | if (ret != -1 && ret != type) |
| 1366 | return -EBUSY; |
| 1367 | return 0; |
| 1368 | } |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1369 | |
| 1370 | static bool use_gss_proxy(struct net *net) |
| 1371 | { |
| 1372 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
| 1373 | |
Jeff Layton | 0fdc267 | 2014-01-04 07:18:05 -0500 | [diff] [blame] | 1374 | /* If use_gss_proxy is still undefined, then try to disable it */ |
| 1375 | if (sn->use_gss_proxy == -1) |
| 1376 | set_gss_proxy(net, 0); |
| 1377 | return sn->use_gss_proxy; |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1378 | } |
| 1379 | |
J. Bruce Fields | 0ff3bab | 2013-04-29 17:03:31 -0400 | [diff] [blame] | 1380 | #ifdef CONFIG_PROC_FS |
| 1381 | |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1382 | static ssize_t write_gssp(struct file *file, const char __user *buf, |
| 1383 | size_t count, loff_t *ppos) |
| 1384 | { |
Al Viro | e77e430 | 2013-06-16 17:25:12 +0400 | [diff] [blame] | 1385 | struct net *net = PDE_DATA(file_inode(file)); |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1386 | char tbuf[20]; |
| 1387 | unsigned long i; |
| 1388 | int res; |
| 1389 | |
| 1390 | if (*ppos || count > sizeof(tbuf)-1) |
| 1391 | return -EINVAL; |
| 1392 | if (copy_from_user(tbuf, buf, count)) |
| 1393 | return -EFAULT; |
| 1394 | |
| 1395 | tbuf[count] = 0; |
| 1396 | res = kstrtoul(tbuf, 0, &i); |
| 1397 | if (res) |
| 1398 | return res; |
| 1399 | if (i != 1) |
| 1400 | return -EINVAL; |
Jeff Layton | a92e5eb | 2014-01-04 07:18:04 -0500 | [diff] [blame] | 1401 | res = set_gssp_clnt(net); |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1402 | if (res) |
| 1403 | return res; |
Jeff Layton | a92e5eb | 2014-01-04 07:18:04 -0500 | [diff] [blame] | 1404 | res = set_gss_proxy(net, 1); |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1405 | if (res) |
| 1406 | return res; |
| 1407 | return count; |
| 1408 | } |
| 1409 | |
| 1410 | static ssize_t read_gssp(struct file *file, char __user *buf, |
| 1411 | size_t count, loff_t *ppos) |
| 1412 | { |
Al Viro | e77e430 | 2013-06-16 17:25:12 +0400 | [diff] [blame] | 1413 | struct net *net = PDE_DATA(file_inode(file)); |
Jeff Layton | 1654a04 | 2014-01-04 07:18:03 -0500 | [diff] [blame] | 1414 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1415 | unsigned long p = *ppos; |
| 1416 | char tbuf[10]; |
| 1417 | size_t len; |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1418 | |
Jeff Layton | 1654a04 | 2014-01-04 07:18:03 -0500 | [diff] [blame] | 1419 | snprintf(tbuf, sizeof(tbuf), "%d\n", sn->use_gss_proxy); |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1420 | len = strlen(tbuf); |
| 1421 | if (p >= len) |
| 1422 | return 0; |
| 1423 | len -= p; |
| 1424 | if (len > count) |
| 1425 | len = count; |
| 1426 | if (copy_to_user(buf, (void *)(tbuf+p), len)) |
| 1427 | return -EFAULT; |
| 1428 | *ppos += len; |
| 1429 | return len; |
| 1430 | } |
| 1431 | |
Alexey Dobriyan | 97a3253 | 2020-02-03 17:37:17 -0800 | [diff] [blame] | 1432 | static const struct proc_ops use_gss_proxy_proc_ops = { |
| 1433 | .proc_open = nonseekable_open, |
| 1434 | .proc_write = write_gssp, |
| 1435 | .proc_read = read_gssp, |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1436 | }; |
| 1437 | |
| 1438 | static int create_use_gss_proxy_proc_entry(struct net *net) |
| 1439 | { |
| 1440 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
| 1441 | struct proc_dir_entry **p = &sn->use_gssp_proc; |
| 1442 | |
| 1443 | sn->use_gss_proxy = -1; |
Joe Perches | d644406 | 2018-03-23 15:54:38 -0700 | [diff] [blame] | 1444 | *p = proc_create_data("use-gss-proxy", S_IFREG | 0600, |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1445 | sn->proc_net_rpc, |
Alexey Dobriyan | 97a3253 | 2020-02-03 17:37:17 -0800 | [diff] [blame] | 1446 | &use_gss_proxy_proc_ops, net); |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1447 | if (!*p) |
| 1448 | return -ENOMEM; |
| 1449 | init_gssp_clnt(sn); |
| 1450 | return 0; |
| 1451 | } |
| 1452 | |
| 1453 | static void destroy_use_gss_proxy_proc_entry(struct net *net) |
| 1454 | { |
| 1455 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
| 1456 | |
| 1457 | if (sn->use_gssp_proc) { |
Stephen Hemminger | 8fdee4c | 2018-07-24 12:29:15 -0700 | [diff] [blame] | 1458 | remove_proc_entry("use-gss-proxy", sn->proc_net_rpc); |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1459 | clear_gssp_clnt(sn); |
| 1460 | } |
| 1461 | } |
J. Bruce Fields | 0ff3bab | 2013-04-29 17:03:31 -0400 | [diff] [blame] | 1462 | #else /* CONFIG_PROC_FS */ |
| 1463 | |
| 1464 | static int create_use_gss_proxy_proc_entry(struct net *net) |
| 1465 | { |
| 1466 | return 0; |
| 1467 | } |
| 1468 | |
| 1469 | static void destroy_use_gss_proxy_proc_entry(struct net *net) {} |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1470 | |
| 1471 | #endif /* CONFIG_PROC_FS */ |
| 1472 | |
J. Bruce Fields | 21fcd02 | 2007-08-09 20:16:22 -0400 | [diff] [blame] | 1473 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1474 | * Accept an rpcsec packet. |
| 1475 | * If context establishment, punt to user space |
| 1476 | * If data exchange, verify/decrypt |
| 1477 | * If context destruction, handle here |
| 1478 | * In the context establishment and destruction case we encode |
| 1479 | * response here and return SVC_COMPLETE. |
| 1480 | */ |
| 1481 | static int |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1482 | svcauth_gss_accept(struct svc_rqst *rqstp, __be32 *authp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1483 | { |
| 1484 | struct kvec *argv = &rqstp->rq_arg.head[0]; |
| 1485 | struct kvec *resv = &rqstp->rq_res.head[0]; |
| 1486 | u32 crlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1487 | struct gss_svc_data *svcdata = rqstp->rq_auth_data; |
| 1488 | struct rpc_gss_wire_cred *gc; |
| 1489 | struct rsc *rsci = NULL; |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1490 | __be32 *rpcstart; |
| 1491 | __be32 *reject_stat = resv->iov_base + resv->iov_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1492 | int ret; |
Vasily Averin | b8be567 | 2018-12-24 14:44:42 +0300 | [diff] [blame] | 1493 | struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1494 | |
Chuck Lever | 2815552 | 2020-03-02 15:16:06 -0500 | [diff] [blame] | 1495 | trace_rpcgss_svc_accept(rqstp->rq_xid, argv->iov_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1496 | |
| 1497 | *authp = rpc_autherr_badcred; |
| 1498 | if (!svcdata) |
| 1499 | svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL); |
| 1500 | if (!svcdata) |
| 1501 | goto auth_err; |
| 1502 | rqstp->rq_auth_data = svcdata; |
J.Bruce Fields | 5b304bc | 2006-10-04 02:16:07 -0700 | [diff] [blame] | 1503 | svcdata->verf_start = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1504 | svcdata->rsci = NULL; |
| 1505 | gc = &svcdata->clcred; |
| 1506 | |
| 1507 | /* start of rpc packet is 7 u32's back from here: |
| 1508 | * xid direction rpcversion prog vers proc flavour |
| 1509 | */ |
| 1510 | rpcstart = argv->iov_base; |
| 1511 | rpcstart -= 7; |
| 1512 | |
| 1513 | /* credential is: |
| 1514 | * version(==1), proc(0,1,2,3), seq, service (1,2,3), handle |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1515 | * at least 5 u32s, and is preceded by length, so that makes 6. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1516 | */ |
| 1517 | |
| 1518 | if (argv->iov_len < 5 * 4) |
| 1519 | goto auth_err; |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1520 | crlen = svc_getnl(argv); |
| 1521 | if (svc_getnl(argv) != RPC_GSS_VERSION) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1522 | goto auth_err; |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1523 | gc->gc_proc = svc_getnl(argv); |
| 1524 | gc->gc_seq = svc_getnl(argv); |
| 1525 | gc->gc_svc = svc_getnl(argv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1526 | if (svc_safe_getnetobj(argv, &gc->gc_ctx)) |
| 1527 | goto auth_err; |
| 1528 | if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4) |
| 1529 | goto auth_err; |
| 1530 | |
| 1531 | if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0)) |
| 1532 | goto auth_err; |
| 1533 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1534 | *authp = rpc_autherr_badverf; |
| 1535 | switch (gc->gc_proc) { |
| 1536 | case RPC_GSS_PROC_INIT: |
| 1537 | case RPC_GSS_PROC_CONTINUE_INIT: |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1538 | if (use_gss_proxy(SVC_NET(rqstp))) |
| 1539 | return svcauth_gss_proxy_init(rqstp, gc, authp); |
| 1540 | else |
| 1541 | return svcauth_gss_legacy_init(rqstp, gc, authp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1542 | case RPC_GSS_PROC_DATA: |
| 1543 | case RPC_GSS_PROC_DESTROY: |
J. Bruce Fields | 21fcd02 | 2007-08-09 20:16:22 -0400 | [diff] [blame] | 1544 | /* Look up the context, and check the verifier: */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1545 | *authp = rpcsec_gsserr_credproblem; |
Stanislav Kinsbursky | a1db410 | 2012-01-19 21:42:37 +0400 | [diff] [blame] | 1546 | rsci = gss_svc_searchbyctx(sn->rsc_cache, &gc->gc_ctx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1547 | if (!rsci) |
| 1548 | goto auth_err; |
| 1549 | switch (gss_verify_header(rqstp, rsci, rpcstart, gc, authp)) { |
| 1550 | case SVC_OK: |
| 1551 | break; |
| 1552 | case SVC_DENIED: |
| 1553 | goto auth_err; |
| 1554 | case SVC_DROP: |
| 1555 | goto drop; |
| 1556 | } |
| 1557 | break; |
| 1558 | default: |
| 1559 | *authp = rpc_autherr_rejectedcred; |
| 1560 | goto auth_err; |
| 1561 | } |
| 1562 | |
| 1563 | /* now act upon the command: */ |
| 1564 | switch (gc->gc_proc) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1565 | case RPC_GSS_PROC_DESTROY: |
Wei Yongjun | c5e434c98 | 2007-05-09 02:34:54 -0700 | [diff] [blame] | 1566 | if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) |
| 1567 | goto auth_err; |
Neil Brown | 2b477c0 | 2016-12-22 12:38:06 -0500 | [diff] [blame] | 1568 | /* Delete the entry from the cache_list and call cache_put */ |
| 1569 | sunrpc_cache_unhash(sn->rsc_cache, &rsci->h); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1570 | if (resv->iov_len + 4 > PAGE_SIZE) |
| 1571 | goto drop; |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1572 | svc_putnl(resv, RPC_SUCCESS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1573 | goto complete; |
| 1574 | case RPC_GSS_PROC_DATA: |
| 1575 | *authp = rpcsec_gsserr_ctxproblem; |
J.Bruce Fields | 5b304bc | 2006-10-04 02:16:07 -0700 | [diff] [blame] | 1576 | svcdata->verf_start = resv->iov_base + resv->iov_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1577 | if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq)) |
| 1578 | goto auth_err; |
| 1579 | rqstp->rq_cred = rsci->cred; |
| 1580 | get_group_info(rsci->cred.cr_group_info); |
| 1581 | *authp = rpc_autherr_badcred; |
| 1582 | switch (gc->gc_svc) { |
| 1583 | case RPC_GSS_SVC_NONE: |
| 1584 | break; |
| 1585 | case RPC_GSS_SVC_INTEGRITY: |
J. Bruce Fields | b620754 | 2008-07-03 15:26:35 -0400 | [diff] [blame] | 1586 | /* placeholders for length and seq. number: */ |
| 1587 | svc_putnl(resv, 0); |
| 1588 | svc_putnl(resv, 0); |
Jeff Layton | 4c190e2 | 2013-02-06 08:28:55 -0500 | [diff] [blame] | 1589 | if (unwrap_integ_data(rqstp, &rqstp->rq_arg, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1590 | gc->gc_seq, rsci->mechctx)) |
Harshula Jayasuriya | dd35210e | 2008-02-20 10:56:56 +1100 | [diff] [blame] | 1591 | goto garbage_args; |
J. Bruce Fields | a5cddc8 | 2014-05-12 18:10:58 -0400 | [diff] [blame] | 1592 | rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE; |
J. Bruce Fields | b620754 | 2008-07-03 15:26:35 -0400 | [diff] [blame] | 1593 | break; |
| 1594 | case RPC_GSS_SVC_PRIVACY: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1595 | /* placeholders for length and seq. number: */ |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1596 | svc_putnl(resv, 0); |
| 1597 | svc_putnl(resv, 0); |
J. Bruce Fields | 7c9fdcf | 2006-06-30 01:56:19 -0700 | [diff] [blame] | 1598 | if (unwrap_priv_data(rqstp, &rqstp->rq_arg, |
| 1599 | gc->gc_seq, rsci->mechctx)) |
Harshula Jayasuriya | dd35210e | 2008-02-20 10:56:56 +1100 | [diff] [blame] | 1600 | goto garbage_args; |
J. Bruce Fields | a5cddc8 | 2014-05-12 18:10:58 -0400 | [diff] [blame] | 1601 | rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE * 2; |
J. Bruce Fields | 7c9fdcf | 2006-06-30 01:56:19 -0700 | [diff] [blame] | 1602 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1603 | default: |
| 1604 | goto auth_err; |
| 1605 | } |
| 1606 | svcdata->rsci = rsci; |
| 1607 | cache_get(&rsci->h); |
J. Bruce Fields | d5497fc | 2012-05-14 22:06:49 -0400 | [diff] [blame] | 1608 | rqstp->rq_cred.cr_flavor = gss_svc_to_pseudoflavor( |
Chuck Lever | 83523d0 | 2013-03-16 15:55:01 -0400 | [diff] [blame] | 1609 | rsci->mechctx->mech_type, |
| 1610 | GSS_C_QOP_DEFAULT, |
| 1611 | gc->gc_svc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1612 | ret = SVC_OK; |
| 1613 | goto out; |
| 1614 | } |
Harshula Jayasuriya | dd35210e | 2008-02-20 10:56:56 +1100 | [diff] [blame] | 1615 | garbage_args: |
Harshula Jayasuriya | dd35210e | 2008-02-20 10:56:56 +1100 | [diff] [blame] | 1616 | ret = SVC_GARBAGE; |
| 1617 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1618 | auth_err: |
J. Bruce Fields | 21fcd02 | 2007-08-09 20:16:22 -0400 | [diff] [blame] | 1619 | /* Restore write pointer to its original value: */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1620 | xdr_ressize_check(rqstp, reject_stat); |
| 1621 | ret = SVC_DENIED; |
| 1622 | goto out; |
| 1623 | complete: |
| 1624 | ret = SVC_COMPLETE; |
| 1625 | goto out; |
| 1626 | drop: |
Chuck Lever | 4d712ef | 2016-11-29 11:04:34 -0500 | [diff] [blame] | 1627 | ret = SVC_CLOSE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1628 | out: |
| 1629 | if (rsci) |
Stanislav Kinsbursky | a1db410 | 2012-01-19 21:42:37 +0400 | [diff] [blame] | 1630 | cache_put(&rsci->h, sn->rsc_cache); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1631 | return ret; |
| 1632 | } |
| 1633 | |
Al Viro | cfbdbab | 2006-10-10 22:49:27 +0100 | [diff] [blame] | 1634 | static __be32 * |
J.Bruce Fields | 3c15a48 | 2006-10-04 02:16:06 -0700 | [diff] [blame] | 1635 | svcauth_gss_prepare_to_wrap(struct xdr_buf *resbuf, struct gss_svc_data *gsd) |
| 1636 | { |
Al Viro | cfbdbab | 2006-10-10 22:49:27 +0100 | [diff] [blame] | 1637 | __be32 *p; |
| 1638 | u32 verf_len; |
J.Bruce Fields | 3c15a48 | 2006-10-04 02:16:06 -0700 | [diff] [blame] | 1639 | |
J.Bruce Fields | 5b304bc | 2006-10-04 02:16:07 -0700 | [diff] [blame] | 1640 | p = gsd->verf_start; |
| 1641 | gsd->verf_start = NULL; |
| 1642 | |
| 1643 | /* If the reply stat is nonzero, don't wrap: */ |
| 1644 | if (*(p-1) != rpc_success) |
| 1645 | return NULL; |
| 1646 | /* Skip the verifier: */ |
| 1647 | p += 1; |
| 1648 | verf_len = ntohl(*p++); |
| 1649 | p += XDR_QUADLEN(verf_len); |
J.Bruce Fields | 3c15a48 | 2006-10-04 02:16:06 -0700 | [diff] [blame] | 1650 | /* move accept_stat to right place: */ |
| 1651 | memcpy(p, p + 2, 4); |
J.Bruce Fields | 5b304bc | 2006-10-04 02:16:07 -0700 | [diff] [blame] | 1652 | /* Also don't wrap if the accept stat is nonzero: */ |
J.Bruce Fields | 3c15a48 | 2006-10-04 02:16:06 -0700 | [diff] [blame] | 1653 | if (*p != rpc_success) { |
| 1654 | resbuf->head[0].iov_len -= 2 * 4; |
| 1655 | return NULL; |
| 1656 | } |
| 1657 | p++; |
| 1658 | return p; |
| 1659 | } |
| 1660 | |
J. Bruce Fields | e142ede | 2006-06-30 01:56:18 -0700 | [diff] [blame] | 1661 | static inline int |
| 1662 | svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1663 | { |
| 1664 | struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; |
| 1665 | struct rpc_gss_wire_cred *gc = &gsd->clcred; |
| 1666 | struct xdr_buf *resbuf = &rqstp->rq_res; |
| 1667 | struct xdr_buf integ_buf; |
| 1668 | struct xdr_netobj mic; |
| 1669 | struct kvec *resv; |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1670 | __be32 *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1671 | int integ_offset, integ_len; |
| 1672 | int stat = -EINVAL; |
| 1673 | |
J.Bruce Fields | 3c15a48 | 2006-10-04 02:16:06 -0700 | [diff] [blame] | 1674 | p = svcauth_gss_prepare_to_wrap(resbuf, gsd); |
| 1675 | if (p == NULL) |
J. Bruce Fields | e142ede | 2006-06-30 01:56:18 -0700 | [diff] [blame] | 1676 | goto out; |
J. Bruce Fields | e142ede | 2006-06-30 01:56:18 -0700 | [diff] [blame] | 1677 | integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base; |
| 1678 | integ_len = resbuf->len - integ_offset; |
Chuck Lever | 96f194b | 2020-03-02 15:01:08 -0500 | [diff] [blame] | 1679 | if (integ_len & 3) |
| 1680 | goto out; |
J. Bruce Fields | e142ede | 2006-06-30 01:56:18 -0700 | [diff] [blame] | 1681 | *p++ = htonl(integ_len); |
| 1682 | *p++ = htonl(gc->gc_seq); |
J. Bruce Fields | 1754eb2 | 2017-10-24 14:58:11 -0400 | [diff] [blame] | 1683 | if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, integ_len)) { |
| 1684 | WARN_ON_ONCE(1); |
| 1685 | goto out_err; |
| 1686 | } |
NeilBrown | 153e44d | 2007-05-09 02:34:52 -0700 | [diff] [blame] | 1687 | if (resbuf->tail[0].iov_base == NULL) { |
J. Bruce Fields | e142ede | 2006-06-30 01:56:18 -0700 | [diff] [blame] | 1688 | if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE) |
| 1689 | goto out_err; |
| 1690 | resbuf->tail[0].iov_base = resbuf->head[0].iov_base |
| 1691 | + resbuf->head[0].iov_len; |
| 1692 | resbuf->tail[0].iov_len = 0; |
J. Bruce Fields | e142ede | 2006-06-30 01:56:18 -0700 | [diff] [blame] | 1693 | } |
J. Bruce Fields | bba0f88 | 2013-01-18 11:33:08 -0500 | [diff] [blame] | 1694 | resv = &resbuf->tail[0]; |
J. Bruce Fields | e142ede | 2006-06-30 01:56:18 -0700 | [diff] [blame] | 1695 | mic.data = (u8 *)resv->iov_base + resv->iov_len + 4; |
| 1696 | if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic)) |
| 1697 | goto out_err; |
Alexey Dobriyan | 7699431 | 2006-09-26 22:28:46 -0700 | [diff] [blame] | 1698 | svc_putnl(resv, mic.len); |
J. Bruce Fields | e142ede | 2006-06-30 01:56:18 -0700 | [diff] [blame] | 1699 | memset(mic.data + mic.len, 0, |
| 1700 | round_up_to_quad(mic.len) - mic.len); |
| 1701 | resv->iov_len += XDR_QUADLEN(mic.len) << 2; |
| 1702 | /* not strictly required: */ |
| 1703 | resbuf->len += XDR_QUADLEN(mic.len) << 2; |
Chuck Lever | 2815552 | 2020-03-02 15:16:06 -0500 | [diff] [blame] | 1704 | if (resv->iov_len > PAGE_SIZE) |
| 1705 | goto out_err; |
J. Bruce Fields | e142ede | 2006-06-30 01:56:18 -0700 | [diff] [blame] | 1706 | out: |
| 1707 | stat = 0; |
| 1708 | out_err: |
| 1709 | return stat; |
| 1710 | } |
| 1711 | |
J. Bruce Fields | 7c9fdcf | 2006-06-30 01:56:19 -0700 | [diff] [blame] | 1712 | static inline int |
| 1713 | svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp) |
| 1714 | { |
| 1715 | struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; |
| 1716 | struct rpc_gss_wire_cred *gc = &gsd->clcred; |
| 1717 | struct xdr_buf *resbuf = &rqstp->rq_res; |
| 1718 | struct page **inpages = NULL; |
Al Viro | 753ed90 | 2006-09-26 22:30:23 -0700 | [diff] [blame] | 1719 | __be32 *p, *len; |
| 1720 | int offset; |
J. Bruce Fields | 7c9fdcf | 2006-06-30 01:56:19 -0700 | [diff] [blame] | 1721 | int pad; |
| 1722 | |
J.Bruce Fields | 3c15a48 | 2006-10-04 02:16:06 -0700 | [diff] [blame] | 1723 | p = svcauth_gss_prepare_to_wrap(resbuf, gsd); |
| 1724 | if (p == NULL) |
J. Bruce Fields | 7c9fdcf | 2006-06-30 01:56:19 -0700 | [diff] [blame] | 1725 | return 0; |
J. Bruce Fields | 7c9fdcf | 2006-06-30 01:56:19 -0700 | [diff] [blame] | 1726 | len = p++; |
| 1727 | offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base; |
| 1728 | *p++ = htonl(gc->gc_seq); |
| 1729 | inpages = resbuf->pages; |
| 1730 | /* XXX: Would be better to write some xdr helper functions for |
| 1731 | * nfs{2,3,4}xdr.c that place the data right, instead of copying: */ |
Kevin Coffman | 7561042 | 2010-03-17 13:02:47 -0400 | [diff] [blame] | 1732 | |
| 1733 | /* |
| 1734 | * If there is currently tail data, make sure there is |
| 1735 | * room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in |
| 1736 | * the page, and move the current tail data such that |
| 1737 | * there is RPC_MAX_AUTH_SIZE slack space available in |
| 1738 | * both the head and tail. |
| 1739 | */ |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 1740 | if (resbuf->tail[0].iov_base) { |
Chuck Lever | 2815552 | 2020-03-02 15:16:06 -0500 | [diff] [blame] | 1741 | if (resbuf->tail[0].iov_base >= |
| 1742 | resbuf->head[0].iov_base + PAGE_SIZE) |
| 1743 | return -EINVAL; |
| 1744 | if (resbuf->tail[0].iov_base < resbuf->head[0].iov_base) |
| 1745 | return -EINVAL; |
J. Bruce Fields | 7c9fdcf | 2006-06-30 01:56:19 -0700 | [diff] [blame] | 1746 | if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len |
| 1747 | + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE) |
| 1748 | return -ENOMEM; |
| 1749 | memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE, |
| 1750 | resbuf->tail[0].iov_base, |
| 1751 | resbuf->tail[0].iov_len); |
| 1752 | resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE; |
| 1753 | } |
Kevin Coffman | 7561042 | 2010-03-17 13:02:47 -0400 | [diff] [blame] | 1754 | /* |
| 1755 | * If there is no current tail data, make sure there is |
| 1756 | * room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the |
| 1757 | * allotted page, and set up tail information such that there |
| 1758 | * is RPC_MAX_AUTH_SIZE slack space available in both the |
| 1759 | * head and tail. |
| 1760 | */ |
J. Bruce Fields | 7c9fdcf | 2006-06-30 01:56:19 -0700 | [diff] [blame] | 1761 | if (resbuf->tail[0].iov_base == NULL) { |
| 1762 | if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE) |
| 1763 | return -ENOMEM; |
| 1764 | resbuf->tail[0].iov_base = resbuf->head[0].iov_base |
| 1765 | + resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE; |
| 1766 | resbuf->tail[0].iov_len = 0; |
J. Bruce Fields | 7c9fdcf | 2006-06-30 01:56:19 -0700 | [diff] [blame] | 1767 | } |
| 1768 | if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages)) |
| 1769 | return -ENOMEM; |
| 1770 | *len = htonl(resbuf->len - offset); |
| 1771 | pad = 3 - ((resbuf->len - offset - 1)&3); |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1772 | p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len); |
J. Bruce Fields | 7c9fdcf | 2006-06-30 01:56:19 -0700 | [diff] [blame] | 1773 | memset(p, 0, pad); |
| 1774 | resbuf->tail[0].iov_len += pad; |
| 1775 | resbuf->len += pad; |
| 1776 | return 0; |
| 1777 | } |
| 1778 | |
J. Bruce Fields | e142ede | 2006-06-30 01:56:18 -0700 | [diff] [blame] | 1779 | static int |
| 1780 | svcauth_gss_release(struct svc_rqst *rqstp) |
| 1781 | { |
| 1782 | struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data; |
| 1783 | struct rpc_gss_wire_cred *gc = &gsd->clcred; |
| 1784 | struct xdr_buf *resbuf = &rqstp->rq_res; |
| 1785 | int stat = -EINVAL; |
Vasily Averin | b8be567 | 2018-12-24 14:44:42 +0300 | [diff] [blame] | 1786 | struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id); |
J. Bruce Fields | e142ede | 2006-06-30 01:56:18 -0700 | [diff] [blame] | 1787 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1788 | if (gc->gc_proc != RPC_GSS_PROC_DATA) |
| 1789 | goto out; |
| 1790 | /* Release can be called twice, but we only wrap once. */ |
J.Bruce Fields | 5b304bc | 2006-10-04 02:16:07 -0700 | [diff] [blame] | 1791 | if (gsd->verf_start == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1792 | goto out; |
| 1793 | /* normally not set till svc_send, but we need it here: */ |
J. Bruce Fields | 7c9fdcf | 2006-06-30 01:56:19 -0700 | [diff] [blame] | 1794 | /* XXX: what for? Do we mess it up the moment we call svc_putu32 |
| 1795 | * or whatever? */ |
| 1796 | resbuf->len = total_buf_len(resbuf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1797 | switch (gc->gc_svc) { |
| 1798 | case RPC_GSS_SVC_NONE: |
| 1799 | break; |
| 1800 | case RPC_GSS_SVC_INTEGRITY: |
J. Bruce Fields | 7c9fdcf | 2006-06-30 01:56:19 -0700 | [diff] [blame] | 1801 | stat = svcauth_gss_wrap_resp_integ(rqstp); |
| 1802 | if (stat) |
| 1803 | goto out_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1804 | break; |
| 1805 | case RPC_GSS_SVC_PRIVACY: |
J. Bruce Fields | 7c9fdcf | 2006-06-30 01:56:19 -0700 | [diff] [blame] | 1806 | stat = svcauth_gss_wrap_resp_priv(rqstp); |
| 1807 | if (stat) |
| 1808 | goto out_err; |
| 1809 | break; |
Wei Yongjun | eac81736 | 2009-08-04 17:27:52 +0800 | [diff] [blame] | 1810 | /* |
| 1811 | * For any other gc_svc value, svcauth_gss_accept() already set |
| 1812 | * the auth_error appropriately; just fall through: |
| 1813 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1814 | } |
| 1815 | |
| 1816 | out: |
| 1817 | stat = 0; |
| 1818 | out_err: |
| 1819 | if (rqstp->rq_client) |
| 1820 | auth_domain_put(rqstp->rq_client); |
| 1821 | rqstp->rq_client = NULL; |
J. Bruce Fields | 3ab4d8b | 2007-07-17 04:04:46 -0700 | [diff] [blame] | 1822 | if (rqstp->rq_gssclient) |
| 1823 | auth_domain_put(rqstp->rq_gssclient); |
| 1824 | rqstp->rq_gssclient = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1825 | if (rqstp->rq_cred.cr_group_info) |
| 1826 | put_group_info(rqstp->rq_cred.cr_group_info); |
| 1827 | rqstp->rq_cred.cr_group_info = NULL; |
| 1828 | if (gsd->rsci) |
Stanislav Kinsbursky | a1db410 | 2012-01-19 21:42:37 +0400 | [diff] [blame] | 1829 | cache_put(&gsd->rsci->h, sn->rsc_cache); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1830 | gsd->rsci = NULL; |
| 1831 | |
| 1832 | return stat; |
| 1833 | } |
| 1834 | |
| 1835 | static void |
Trond Myklebust | 608a0ab | 2018-10-01 10:41:44 -0400 | [diff] [blame] | 1836 | svcauth_gss_domain_release_rcu(struct rcu_head *head) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1837 | { |
Trond Myklebust | 608a0ab | 2018-10-01 10:41:44 -0400 | [diff] [blame] | 1838 | struct auth_domain *dom = container_of(head, struct auth_domain, rcu_head); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1839 | struct gss_domain *gd = container_of(dom, struct gss_domain, h); |
| 1840 | |
| 1841 | kfree(dom->name); |
| 1842 | kfree(gd); |
| 1843 | } |
| 1844 | |
Trond Myklebust | 608a0ab | 2018-10-01 10:41:44 -0400 | [diff] [blame] | 1845 | static void |
| 1846 | svcauth_gss_domain_release(struct auth_domain *dom) |
| 1847 | { |
| 1848 | call_rcu(&dom->rcu_head, svcauth_gss_domain_release_rcu); |
| 1849 | } |
| 1850 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1851 | static struct auth_ops svcauthops_gss = { |
| 1852 | .name = "rpcsec_gss", |
| 1853 | .owner = THIS_MODULE, |
| 1854 | .flavour = RPC_AUTH_GSS, |
| 1855 | .accept = svcauth_gss_accept, |
| 1856 | .release = svcauth_gss_release, |
| 1857 | .domain_release = svcauth_gss_domain_release, |
| 1858 | .set_client = svcauth_gss_set_client, |
| 1859 | }; |
| 1860 | |
Stanislav Kinsbursky | a1db410 | 2012-01-19 21:42:37 +0400 | [diff] [blame] | 1861 | static int rsi_cache_create_net(struct net *net) |
| 1862 | { |
| 1863 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
| 1864 | struct cache_detail *cd; |
| 1865 | int err; |
| 1866 | |
| 1867 | cd = cache_create_net(&rsi_cache_template, net); |
| 1868 | if (IS_ERR(cd)) |
| 1869 | return PTR_ERR(cd); |
| 1870 | err = cache_register_net(cd, net); |
| 1871 | if (err) { |
| 1872 | cache_destroy_net(cd, net); |
| 1873 | return err; |
| 1874 | } |
| 1875 | sn->rsi_cache = cd; |
| 1876 | return 0; |
| 1877 | } |
| 1878 | |
| 1879 | static void rsi_cache_destroy_net(struct net *net) |
| 1880 | { |
| 1881 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
| 1882 | struct cache_detail *cd = sn->rsi_cache; |
| 1883 | |
| 1884 | sn->rsi_cache = NULL; |
| 1885 | cache_purge(cd); |
| 1886 | cache_unregister_net(cd, net); |
| 1887 | cache_destroy_net(cd, net); |
| 1888 | } |
| 1889 | |
| 1890 | static int rsc_cache_create_net(struct net *net) |
| 1891 | { |
| 1892 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
| 1893 | struct cache_detail *cd; |
| 1894 | int err; |
| 1895 | |
| 1896 | cd = cache_create_net(&rsc_cache_template, net); |
| 1897 | if (IS_ERR(cd)) |
| 1898 | return PTR_ERR(cd); |
| 1899 | err = cache_register_net(cd, net); |
| 1900 | if (err) { |
| 1901 | cache_destroy_net(cd, net); |
| 1902 | return err; |
| 1903 | } |
| 1904 | sn->rsc_cache = cd; |
| 1905 | return 0; |
| 1906 | } |
| 1907 | |
| 1908 | static void rsc_cache_destroy_net(struct net *net) |
| 1909 | { |
| 1910 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
| 1911 | struct cache_detail *cd = sn->rsc_cache; |
| 1912 | |
| 1913 | sn->rsc_cache = NULL; |
| 1914 | cache_purge(cd); |
| 1915 | cache_unregister_net(cd, net); |
| 1916 | cache_destroy_net(cd, net); |
| 1917 | } |
| 1918 | |
| 1919 | int |
| 1920 | gss_svc_init_net(struct net *net) |
| 1921 | { |
| 1922 | int rv; |
| 1923 | |
| 1924 | rv = rsc_cache_create_net(net); |
| 1925 | if (rv) |
| 1926 | return rv; |
| 1927 | rv = rsi_cache_create_net(net); |
| 1928 | if (rv) |
| 1929 | goto out1; |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1930 | rv = create_use_gss_proxy_proc_entry(net); |
| 1931 | if (rv) |
| 1932 | goto out2; |
Stanislav Kinsbursky | a1db410 | 2012-01-19 21:42:37 +0400 | [diff] [blame] | 1933 | return 0; |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1934 | out2: |
| 1935 | destroy_use_gss_proxy_proc_entry(net); |
Stanislav Kinsbursky | a1db410 | 2012-01-19 21:42:37 +0400 | [diff] [blame] | 1936 | out1: |
| 1937 | rsc_cache_destroy_net(net); |
| 1938 | return rv; |
| 1939 | } |
| 1940 | |
| 1941 | void |
| 1942 | gss_svc_shutdown_net(struct net *net) |
| 1943 | { |
Simo Sorce | 030d794 | 2012-05-25 18:09:56 -0400 | [diff] [blame] | 1944 | destroy_use_gss_proxy_proc_entry(net); |
Stanislav Kinsbursky | a1db410 | 2012-01-19 21:42:37 +0400 | [diff] [blame] | 1945 | rsi_cache_destroy_net(net); |
| 1946 | rsc_cache_destroy_net(net); |
| 1947 | } |
| 1948 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1949 | int |
| 1950 | gss_svc_init(void) |
| 1951 | { |
Stanislav Kinsbursky | a1db410 | 2012-01-19 21:42:37 +0400 | [diff] [blame] | 1952 | return svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1953 | } |
| 1954 | |
| 1955 | void |
| 1956 | gss_svc_shutdown(void) |
| 1957 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1958 | svc_auth_unregister(RPC_AUTH_GSS); |
| 1959 | } |