Commit | Line | Data |
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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | #include <linux/types.h> |
3 | #include <linux/sched.h> | |
4 | #include <linux/module.h> | |
5 | #include <linux/sunrpc/types.h> | |
6 | #include <linux/sunrpc/xdr.h> | |
7 | #include <linux/sunrpc/svcsock.h> | |
8 | #include <linux/sunrpc/svcauth.h> | |
c4170583 | 9 | #include <linux/sunrpc/gss_api.h> |
5976687a | 10 | #include <linux/sunrpc/addr.h> |
1da177e4 LT |
11 | #include <linux/err.h> |
12 | #include <linux/seq_file.h> | |
13 | #include <linux/hash.h> | |
543537bd | 14 | #include <linux/string.h> |
5a0e3ad6 | 15 | #include <linux/slab.h> |
7b2b1fee | 16 | #include <net/sock.h> |
f15364bd AC |
17 | #include <net/ipv6.h> |
18 | #include <linux/kernel.h> | |
ae2975bc | 19 | #include <linux/user_namespace.h> |
1da177e4 LT |
20 | #define RPCDBG_FACILITY RPCDBG_AUTH |
21 | ||
22 | ||
90d51b02 PE |
23 | #include "netns.h" |
24 | ||
1da177e4 LT |
25 | /* |
26 | * AUTHUNIX and AUTHNULL credentials are both handled here. | |
27 | * AUTHNULL is treated just like AUTHUNIX except that the uid/gid | |
28 | * are always nobody (-2). i.e. we do the same IP address checks for | |
29 | * AUTHNULL as for AUTHUNIX, and that is done here. | |
30 | */ | |
31 | ||
32 | ||
1da177e4 LT |
33 | struct unix_domain { |
34 | struct auth_domain h; | |
1da177e4 LT |
35 | /* other stuff later */ |
36 | }; | |
37 | ||
13e0e958 | 38 | extern struct auth_ops svcauth_null; |
efc36aa5 N |
39 | extern struct auth_ops svcauth_unix; |
40 | ||
608a0ab2 | 41 | static void svcauth_unix_domain_release_rcu(struct rcu_head *head) |
8b3e07ac | 42 | { |
608a0ab2 | 43 | struct auth_domain *dom = container_of(head, struct auth_domain, rcu_head); |
8b3e07ac BF |
44 | struct unix_domain *ud = container_of(dom, struct unix_domain, h); |
45 | ||
46 | kfree(dom->name); | |
47 | kfree(ud); | |
48 | } | |
49 | ||
608a0ab2 TM |
50 | static void svcauth_unix_domain_release(struct auth_domain *dom) |
51 | { | |
52 | call_rcu(&dom->rcu_head, svcauth_unix_domain_release_rcu); | |
53 | } | |
54 | ||
1da177e4 LT |
55 | struct auth_domain *unix_domain_find(char *name) |
56 | { | |
efc36aa5 N |
57 | struct auth_domain *rv; |
58 | struct unix_domain *new = NULL; | |
59 | ||
608a0ab2 | 60 | rv = auth_domain_find(name); |
efc36aa5 | 61 | while(1) { |
ad1b5229 N |
62 | if (rv) { |
63 | if (new && rv != &new->h) | |
352b5d13 | 64 | svcauth_unix_domain_release(&new->h); |
ad1b5229 N |
65 | |
66 | if (rv->flavour != &svcauth_unix) { | |
67 | auth_domain_put(rv); | |
68 | return NULL; | |
69 | } | |
efc36aa5 N |
70 | return rv; |
71 | } | |
efc36aa5 N |
72 | |
73 | new = kmalloc(sizeof(*new), GFP_KERNEL); | |
74 | if (new == NULL) | |
75 | return NULL; | |
76 | kref_init(&new->h.ref); | |
77 | new->h.name = kstrdup(name, GFP_KERNEL); | |
dd08d6ea N |
78 | if (new->h.name == NULL) { |
79 | kfree(new); | |
80 | return NULL; | |
81 | } | |
efc36aa5 | 82 | new->h.flavour = &svcauth_unix; |
efc36aa5 | 83 | rv = auth_domain_lookup(name, &new->h); |
1da177e4 | 84 | } |
1da177e4 | 85 | } |
24c3767e | 86 | EXPORT_SYMBOL_GPL(unix_domain_find); |
1da177e4 | 87 | |
1da177e4 LT |
88 | |
89 | /************************************************** | |
90 | * cache for IP address to unix_domain | |
91 | * as needed by AUTH_UNIX | |
92 | */ | |
93 | #define IP_HASHBITS 8 | |
94 | #define IP_HASHMAX (1<<IP_HASHBITS) | |
1da177e4 LT |
95 | |
96 | struct ip_map { | |
97 | struct cache_head h; | |
98 | char m_class[8]; /* e.g. "nfsd" */ | |
f15364bd | 99 | struct in6_addr m_addr; |
1da177e4 | 100 | struct unix_domain *m_client; |
fd5d2f78 | 101 | struct rcu_head m_rcu; |
1da177e4 | 102 | }; |
1da177e4 | 103 | |
baab935f | 104 | static void ip_map_put(struct kref *kref) |
1da177e4 | 105 | { |
baab935f | 106 | struct cache_head *item = container_of(kref, struct cache_head, ref); |
1da177e4 | 107 | struct ip_map *im = container_of(item, struct ip_map,h); |
baab935f N |
108 | |
109 | if (test_bit(CACHE_VALID, &item->flags) && | |
110 | !test_bit(CACHE_NEGATIVE, &item->flags)) | |
111 | auth_domain_put(&im->m_client->h); | |
fd5d2f78 | 112 | kfree_rcu(im, m_rcu); |
1da177e4 LT |
113 | } |
114 | ||
ddbe5032 | 115 | static inline int hash_ip6(const struct in6_addr *ip) |
f15364bd | 116 | { |
ddbe5032 | 117 | return hash_32(ipv6_addr_hash(ip), IP_HASHBITS); |
f15364bd | 118 | } |
1a9917c2 | 119 | static int ip_map_match(struct cache_head *corig, struct cache_head *cnew) |
1da177e4 | 120 | { |
1a9917c2 N |
121 | struct ip_map *orig = container_of(corig, struct ip_map, h); |
122 | struct ip_map *new = container_of(cnew, struct ip_map, h); | |
f64f9e71 JP |
123 | return strcmp(orig->m_class, new->m_class) == 0 && |
124 | ipv6_addr_equal(&orig->m_addr, &new->m_addr); | |
1da177e4 | 125 | } |
1a9917c2 | 126 | static void ip_map_init(struct cache_head *cnew, struct cache_head *citem) |
1da177e4 | 127 | { |
1a9917c2 N |
128 | struct ip_map *new = container_of(cnew, struct ip_map, h); |
129 | struct ip_map *item = container_of(citem, struct ip_map, h); | |
130 | ||
1da177e4 | 131 | strcpy(new->m_class, item->m_class); |
4e3fd7a0 | 132 | new->m_addr = item->m_addr; |
1da177e4 | 133 | } |
1a9917c2 | 134 | static void update(struct cache_head *cnew, struct cache_head *citem) |
1da177e4 | 135 | { |
1a9917c2 N |
136 | struct ip_map *new = container_of(cnew, struct ip_map, h); |
137 | struct ip_map *item = container_of(citem, struct ip_map, h); | |
138 | ||
efc36aa5 | 139 | kref_get(&item->m_client->h.ref); |
1da177e4 | 140 | new->m_client = item->m_client; |
1da177e4 | 141 | } |
1a9917c2 N |
142 | static struct cache_head *ip_map_alloc(void) |
143 | { | |
144 | struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL); | |
145 | if (i) | |
146 | return &i->h; | |
147 | else | |
148 | return NULL; | |
149 | } | |
1da177e4 LT |
150 | |
151 | static void ip_map_request(struct cache_detail *cd, | |
152 | struct cache_head *h, | |
153 | char **bpp, int *blen) | |
154 | { | |
f15364bd | 155 | char text_addr[40]; |
1da177e4 | 156 | struct ip_map *im = container_of(h, struct ip_map, h); |
1da177e4 | 157 | |
f15364bd | 158 | if (ipv6_addr_v4mapped(&(im->m_addr))) { |
21454aaa | 159 | snprintf(text_addr, 20, "%pI4", &im->m_addr.s6_addr32[3]); |
f15364bd | 160 | } else { |
5b095d98 | 161 | snprintf(text_addr, 40, "%pI6", &im->m_addr); |
f15364bd | 162 | } |
1da177e4 LT |
163 | qword_add(bpp, blen, im->m_class); |
164 | qword_add(bpp, blen, text_addr); | |
165 | (*bpp)[-1] = '\n'; | |
166 | } | |
167 | ||
bf18ab32 | 168 | static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class, struct in6_addr *addr); |
f559935e | 169 | static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm, struct unix_domain *udom, time64_t expiry); |
1da177e4 LT |
170 | |
171 | static int ip_map_parse(struct cache_detail *cd, | |
172 | char *mesg, int mlen) | |
173 | { | |
174 | /* class ipaddress [domainname] */ | |
175 | /* should be safe just to use the start of the input buffer | |
176 | * for scratch: */ | |
177 | char *buf = mesg; | |
178 | int len; | |
1a9917c2 | 179 | char class[8]; |
07396051 CL |
180 | union { |
181 | struct sockaddr sa; | |
182 | struct sockaddr_in s4; | |
183 | struct sockaddr_in6 s6; | |
184 | } address; | |
185 | struct sockaddr_in6 sin6; | |
1a9917c2 N |
186 | int err; |
187 | ||
188 | struct ip_map *ipmp; | |
1da177e4 | 189 | struct auth_domain *dom; |
f559935e | 190 | time64_t expiry; |
1da177e4 LT |
191 | |
192 | if (mesg[mlen-1] != '\n') | |
193 | return -EINVAL; | |
194 | mesg[mlen-1] = 0; | |
195 | ||
196 | /* class */ | |
1a9917c2 | 197 | len = qword_get(&mesg, class, sizeof(class)); |
1da177e4 LT |
198 | if (len <= 0) return -EINVAL; |
199 | ||
200 | /* ip address */ | |
201 | len = qword_get(&mesg, buf, mlen); | |
202 | if (len <= 0) return -EINVAL; | |
203 | ||
d05cc104 | 204 | if (rpc_pton(cd->net, buf, len, &address.sa, sizeof(address)) == 0) |
1da177e4 | 205 | return -EINVAL; |
07396051 CL |
206 | switch (address.sa.sa_family) { |
207 | case AF_INET: | |
208 | /* Form a mapped IPv4 address in sin6 */ | |
07396051 | 209 | sin6.sin6_family = AF_INET6; |
70dc78da PE |
210 | ipv6_addr_set_v4mapped(address.s4.sin_addr.s_addr, |
211 | &sin6.sin6_addr); | |
07396051 | 212 | break; |
dfd56b8b | 213 | #if IS_ENABLED(CONFIG_IPV6) |
07396051 CL |
214 | case AF_INET6: |
215 | memcpy(&sin6, &address.s6, sizeof(sin6)); | |
216 | break; | |
217 | #endif | |
218 | default: | |
219 | return -EINVAL; | |
220 | } | |
cca5172a | 221 | |
1da177e4 LT |
222 | expiry = get_expiry(&mesg); |
223 | if (expiry ==0) | |
224 | return -EINVAL; | |
225 | ||
226 | /* domainname, or empty for NEGATIVE */ | |
227 | len = qword_get(&mesg, buf, mlen); | |
228 | if (len < 0) return -EINVAL; | |
229 | ||
230 | if (len) { | |
231 | dom = unix_domain_find(buf); | |
232 | if (dom == NULL) | |
233 | return -ENOENT; | |
234 | } else | |
235 | dom = NULL; | |
236 | ||
07396051 | 237 | /* IPv6 scope IDs are ignored for now */ |
bf18ab32 | 238 | ipmp = __ip_map_lookup(cd, class, &sin6.sin6_addr); |
1a9917c2 | 239 | if (ipmp) { |
bf18ab32 | 240 | err = __ip_map_update(cd, ipmp, |
1a9917c2 N |
241 | container_of(dom, struct unix_domain, h), |
242 | expiry); | |
1da177e4 | 243 | } else |
1a9917c2 | 244 | err = -ENOMEM; |
1da177e4 | 245 | |
1da177e4 LT |
246 | if (dom) |
247 | auth_domain_put(dom); | |
1a9917c2 | 248 | |
1da177e4 | 249 | cache_flush(); |
1a9917c2 | 250 | return err; |
1da177e4 LT |
251 | } |
252 | ||
253 | static int ip_map_show(struct seq_file *m, | |
254 | struct cache_detail *cd, | |
255 | struct cache_head *h) | |
256 | { | |
257 | struct ip_map *im; | |
f15364bd | 258 | struct in6_addr addr; |
1da177e4 LT |
259 | char *dom = "-no-domain-"; |
260 | ||
261 | if (h == NULL) { | |
262 | seq_puts(m, "#class IP domain\n"); | |
263 | return 0; | |
264 | } | |
265 | im = container_of(h, struct ip_map, h); | |
266 | /* class addr domain */ | |
4e3fd7a0 | 267 | addr = im->m_addr; |
1da177e4 | 268 | |
cca5172a | 269 | if (test_bit(CACHE_VALID, &h->flags) && |
1da177e4 LT |
270 | !test_bit(CACHE_NEGATIVE, &h->flags)) |
271 | dom = im->m_client->h.name; | |
272 | ||
f15364bd | 273 | if (ipv6_addr_v4mapped(&addr)) { |
21454aaa HH |
274 | seq_printf(m, "%s %pI4 %s\n", |
275 | im->m_class, &addr.s6_addr32[3], dom); | |
f15364bd | 276 | } else { |
5b095d98 | 277 | seq_printf(m, "%s %pI6 %s\n", im->m_class, &addr, dom); |
f15364bd | 278 | } |
1da177e4 LT |
279 | return 0; |
280 | } | |
cca5172a | 281 | |
1da177e4 | 282 | |
bf18ab32 PE |
283 | static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class, |
284 | struct in6_addr *addr) | |
1a9917c2 N |
285 | { |
286 | struct ip_map ip; | |
287 | struct cache_head *ch; | |
288 | ||
289 | strcpy(ip.m_class, class); | |
4e3fd7a0 | 290 | ip.m_addr = *addr; |
fd5d2f78 TM |
291 | ch = sunrpc_cache_lookup_rcu(cd, &ip.h, |
292 | hash_str(class, IP_HASHBITS) ^ | |
293 | hash_ip6(addr)); | |
1a9917c2 N |
294 | |
295 | if (ch) | |
296 | return container_of(ch, struct ip_map, h); | |
297 | else | |
298 | return NULL; | |
299 | } | |
1da177e4 | 300 | |
352114f3 PE |
301 | static inline struct ip_map *ip_map_lookup(struct net *net, char *class, |
302 | struct in6_addr *addr) | |
bf18ab32 | 303 | { |
90d51b02 PE |
304 | struct sunrpc_net *sn; |
305 | ||
306 | sn = net_generic(net, sunrpc_net_id); | |
307 | return __ip_map_lookup(sn->ip_map_cache, class, addr); | |
bf18ab32 PE |
308 | } |
309 | ||
310 | static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm, | |
f559935e | 311 | struct unix_domain *udom, time64_t expiry) |
1a9917c2 N |
312 | { |
313 | struct ip_map ip; | |
314 | struct cache_head *ch; | |
315 | ||
316 | ip.m_client = udom; | |
317 | ip.h.flags = 0; | |
318 | if (!udom) | |
319 | set_bit(CACHE_NEGATIVE, &ip.h.flags); | |
1a9917c2 | 320 | ip.h.expiry_time = expiry; |
bf18ab32 | 321 | ch = sunrpc_cache_update(cd, &ip.h, &ipm->h, |
1a9917c2 | 322 | hash_str(ipm->m_class, IP_HASHBITS) ^ |
ddbe5032 | 323 | hash_ip6(&ipm->m_addr)); |
1a9917c2 N |
324 | if (!ch) |
325 | return -ENOMEM; | |
bf18ab32 | 326 | cache_put(ch, cd); |
1a9917c2 N |
327 | return 0; |
328 | } | |
1da177e4 | 329 | |
352114f3 | 330 | static inline int ip_map_update(struct net *net, struct ip_map *ipm, |
f559935e | 331 | struct unix_domain *udom, time64_t expiry) |
bf18ab32 | 332 | { |
90d51b02 PE |
333 | struct sunrpc_net *sn; |
334 | ||
335 | sn = net_generic(net, sunrpc_net_id); | |
336 | return __ip_map_update(sn->ip_map_cache, ipm, udom, expiry); | |
bf18ab32 PE |
337 | } |
338 | ||
e5f06f72 | 339 | void svcauth_unix_purge(struct net *net) |
1da177e4 | 340 | { |
e5f06f72 | 341 | struct sunrpc_net *sn; |
90d51b02 | 342 | |
e5f06f72 SK |
343 | sn = net_generic(net, sunrpc_net_id); |
344 | cache_purge(sn->ip_map_cache); | |
1da177e4 | 345 | } |
24c3767e | 346 | EXPORT_SYMBOL_GPL(svcauth_unix_purge); |
1da177e4 | 347 | |
7b2b1fee | 348 | static inline struct ip_map * |
3be4479f | 349 | ip_map_cached_get(struct svc_xprt *xprt) |
7b2b1fee | 350 | { |
def13d74 | 351 | struct ip_map *ipm = NULL; |
90d51b02 | 352 | struct sunrpc_net *sn; |
def13d74 TT |
353 | |
354 | if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) { | |
355 | spin_lock(&xprt->xpt_lock); | |
356 | ipm = xprt->xpt_auth_cache; | |
357 | if (ipm != NULL) { | |
7715cde8 N |
358 | sn = net_generic(xprt->xpt_net, sunrpc_net_id); |
359 | if (cache_is_expired(sn->ip_map_cache, &ipm->h)) { | |
def13d74 TT |
360 | /* |
361 | * The entry has been invalidated since it was | |
362 | * remembered, e.g. by a second mount from the | |
363 | * same IP address. | |
364 | */ | |
365 | xprt->xpt_auth_cache = NULL; | |
366 | spin_unlock(&xprt->xpt_lock); | |
90d51b02 | 367 | cache_put(&ipm->h, sn->ip_map_cache); |
def13d74 TT |
368 | return NULL; |
369 | } | |
370 | cache_get(&ipm->h); | |
7b2b1fee | 371 | } |
def13d74 | 372 | spin_unlock(&xprt->xpt_lock); |
7b2b1fee GB |
373 | } |
374 | return ipm; | |
375 | } | |
376 | ||
377 | static inline void | |
3be4479f | 378 | ip_map_cached_put(struct svc_xprt *xprt, struct ip_map *ipm) |
7b2b1fee | 379 | { |
def13d74 TT |
380 | if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) { |
381 | spin_lock(&xprt->xpt_lock); | |
382 | if (xprt->xpt_auth_cache == NULL) { | |
383 | /* newly cached, keep the reference */ | |
384 | xprt->xpt_auth_cache = ipm; | |
385 | ipm = NULL; | |
386 | } | |
387 | spin_unlock(&xprt->xpt_lock); | |
30f3deee | 388 | } |
90d51b02 PE |
389 | if (ipm) { |
390 | struct sunrpc_net *sn; | |
391 | ||
392 | sn = net_generic(xprt->xpt_net, sunrpc_net_id); | |
393 | cache_put(&ipm->h, sn->ip_map_cache); | |
394 | } | |
7b2b1fee GB |
395 | } |
396 | ||
397 | void | |
e3bfca01 | 398 | svcauth_unix_info_release(struct svc_xprt *xpt) |
7b2b1fee | 399 | { |
e3bfca01 PE |
400 | struct ip_map *ipm; |
401 | ||
402 | ipm = xpt->xpt_auth_cache; | |
90d51b02 PE |
403 | if (ipm != NULL) { |
404 | struct sunrpc_net *sn; | |
405 | ||
406 | sn = net_generic(xpt->xpt_net, sunrpc_net_id); | |
407 | cache_put(&ipm->h, sn->ip_map_cache); | |
408 | } | |
7b2b1fee GB |
409 | } |
410 | ||
3fc605a2 N |
411 | /**************************************************************************** |
412 | * auth.unix.gid cache | |
413 | * simple cache to map a UID to a list of GIDs | |
5786461b | 414 | * because AUTH_UNIX aka AUTH_SYS has a max of UNX_NGROUPS |
3fc605a2 N |
415 | */ |
416 | #define GID_HASHBITS 8 | |
417 | #define GID_HASHMAX (1<<GID_HASHBITS) | |
3fc605a2 N |
418 | |
419 | struct unix_gid { | |
420 | struct cache_head h; | |
7eaf040b | 421 | kuid_t uid; |
3fc605a2 | 422 | struct group_info *gi; |
fd5d2f78 | 423 | struct rcu_head rcu; |
3fc605a2 | 424 | }; |
3fc605a2 | 425 | |
9e469e30 EB |
426 | static int unix_gid_hash(kuid_t uid) |
427 | { | |
428 | return hash_long(from_kuid(&init_user_ns, uid), GID_HASHBITS); | |
429 | } | |
430 | ||
3fc605a2 N |
431 | static void unix_gid_put(struct kref *kref) |
432 | { | |
433 | struct cache_head *item = container_of(kref, struct cache_head, ref); | |
434 | struct unix_gid *ug = container_of(item, struct unix_gid, h); | |
435 | if (test_bit(CACHE_VALID, &item->flags) && | |
436 | !test_bit(CACHE_NEGATIVE, &item->flags)) | |
437 | put_group_info(ug->gi); | |
fd5d2f78 | 438 | kfree_rcu(ug, rcu); |
3fc605a2 N |
439 | } |
440 | ||
441 | static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew) | |
442 | { | |
443 | struct unix_gid *orig = container_of(corig, struct unix_gid, h); | |
444 | struct unix_gid *new = container_of(cnew, struct unix_gid, h); | |
0b4d51b0 | 445 | return uid_eq(orig->uid, new->uid); |
3fc605a2 N |
446 | } |
447 | static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem) | |
448 | { | |
449 | struct unix_gid *new = container_of(cnew, struct unix_gid, h); | |
450 | struct unix_gid *item = container_of(citem, struct unix_gid, h); | |
451 | new->uid = item->uid; | |
452 | } | |
453 | static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem) | |
454 | { | |
455 | struct unix_gid *new = container_of(cnew, struct unix_gid, h); | |
456 | struct unix_gid *item = container_of(citem, struct unix_gid, h); | |
457 | ||
458 | get_group_info(item->gi); | |
459 | new->gi = item->gi; | |
460 | } | |
461 | static struct cache_head *unix_gid_alloc(void) | |
462 | { | |
463 | struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL); | |
464 | if (g) | |
465 | return &g->h; | |
466 | else | |
467 | return NULL; | |
468 | } | |
469 | ||
470 | static void unix_gid_request(struct cache_detail *cd, | |
471 | struct cache_head *h, | |
472 | char **bpp, int *blen) | |
473 | { | |
474 | char tuid[20]; | |
475 | struct unix_gid *ug = container_of(h, struct unix_gid, h); | |
476 | ||
25da9263 | 477 | snprintf(tuid, 20, "%u", from_kuid(&init_user_ns, ug->uid)); |
3fc605a2 N |
478 | qword_add(bpp, blen, tuid); |
479 | (*bpp)[-1] = '\n'; | |
480 | } | |
481 | ||
7eaf040b | 482 | static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid); |
3fc605a2 N |
483 | |
484 | static int unix_gid_parse(struct cache_detail *cd, | |
485 | char *mesg, int mlen) | |
486 | { | |
487 | /* uid expiry Ngid gid0 gid1 ... gidN-1 */ | |
25da9263 EB |
488 | int id; |
489 | kuid_t uid; | |
3fc605a2 N |
490 | int gids; |
491 | int rv; | |
492 | int i; | |
493 | int err; | |
f559935e | 494 | time64_t expiry; |
3fc605a2 N |
495 | struct unix_gid ug, *ugp; |
496 | ||
3476964d | 497 | if (mesg[mlen - 1] != '\n') |
3fc605a2 N |
498 | return -EINVAL; |
499 | mesg[mlen-1] = 0; | |
500 | ||
25da9263 | 501 | rv = get_int(&mesg, &id); |
3fc605a2 N |
502 | if (rv) |
503 | return -EINVAL; | |
ccfe51a5 | 504 | uid = make_kuid(current_user_ns(), id); |
3fc605a2 N |
505 | ug.uid = uid; |
506 | ||
507 | expiry = get_expiry(&mesg); | |
508 | if (expiry == 0) | |
509 | return -EINVAL; | |
510 | ||
511 | rv = get_int(&mesg, &gids); | |
512 | if (rv || gids < 0 || gids > 8192) | |
513 | return -EINVAL; | |
514 | ||
515 | ug.gi = groups_alloc(gids); | |
516 | if (!ug.gi) | |
517 | return -ENOMEM; | |
518 | ||
519 | for (i = 0 ; i < gids ; i++) { | |
520 | int gid; | |
ae2975bc | 521 | kgid_t kgid; |
3fc605a2 N |
522 | rv = get_int(&mesg, &gid); |
523 | err = -EINVAL; | |
524 | if (rv) | |
525 | goto out; | |
ccfe51a5 | 526 | kgid = make_kgid(current_user_ns(), gid); |
ae2975bc EB |
527 | if (!gid_valid(kgid)) |
528 | goto out; | |
81243eac | 529 | ug.gi->gid[i] = kgid; |
3fc605a2 N |
530 | } |
531 | ||
bdcf0a42 | 532 | groups_sort(ug.gi); |
73393232 | 533 | ugp = unix_gid_lookup(cd, uid); |
3fc605a2 N |
534 | if (ugp) { |
535 | struct cache_head *ch; | |
536 | ug.h.flags = 0; | |
537 | ug.h.expiry_time = expiry; | |
73393232 | 538 | ch = sunrpc_cache_update(cd, |
3fc605a2 | 539 | &ug.h, &ugp->h, |
9e469e30 | 540 | unix_gid_hash(uid)); |
3fc605a2 N |
541 | if (!ch) |
542 | err = -ENOMEM; | |
543 | else { | |
544 | err = 0; | |
73393232 | 545 | cache_put(ch, cd); |
3fc605a2 N |
546 | } |
547 | } else | |
548 | err = -ENOMEM; | |
549 | out: | |
550 | if (ug.gi) | |
551 | put_group_info(ug.gi); | |
552 | return err; | |
553 | } | |
554 | ||
555 | static int unix_gid_show(struct seq_file *m, | |
556 | struct cache_detail *cd, | |
557 | struct cache_head *h) | |
558 | { | |
ccfe51a5 | 559 | struct user_namespace *user_ns = m->file->f_cred->user_ns; |
3fc605a2 N |
560 | struct unix_gid *ug; |
561 | int i; | |
562 | int glen; | |
563 | ||
564 | if (h == NULL) { | |
565 | seq_puts(m, "#uid cnt: gids...\n"); | |
566 | return 0; | |
567 | } | |
568 | ug = container_of(h, struct unix_gid, h); | |
569 | if (test_bit(CACHE_VALID, &h->flags) && | |
570 | !test_bit(CACHE_NEGATIVE, &h->flags)) | |
571 | glen = ug->gi->ngroups; | |
572 | else | |
573 | glen = 0; | |
574 | ||
25da9263 | 575 | seq_printf(m, "%u %d:", from_kuid_munged(user_ns, ug->uid), glen); |
3fc605a2 | 576 | for (i = 0; i < glen; i++) |
81243eac | 577 | seq_printf(m, " %d", from_kgid_munged(user_ns, ug->gi->gid[i])); |
3fc605a2 N |
578 | seq_printf(m, "\n"); |
579 | return 0; | |
580 | } | |
581 | ||
ee24eac3 | 582 | static const struct cache_detail unix_gid_cache_template = { |
3fc605a2 N |
583 | .owner = THIS_MODULE, |
584 | .hash_size = GID_HASHMAX, | |
3fc605a2 N |
585 | .name = "auth.unix.gid", |
586 | .cache_put = unix_gid_put, | |
73fb847a | 587 | .cache_request = unix_gid_request, |
3fc605a2 N |
588 | .cache_parse = unix_gid_parse, |
589 | .cache_show = unix_gid_show, | |
590 | .match = unix_gid_match, | |
591 | .init = unix_gid_init, | |
592 | .update = unix_gid_update, | |
593 | .alloc = unix_gid_alloc, | |
594 | }; | |
595 | ||
73393232 SK |
596 | int unix_gid_cache_create(struct net *net) |
597 | { | |
598 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
599 | struct cache_detail *cd; | |
600 | int err; | |
601 | ||
602 | cd = cache_create_net(&unix_gid_cache_template, net); | |
603 | if (IS_ERR(cd)) | |
604 | return PTR_ERR(cd); | |
605 | err = cache_register_net(cd, net); | |
606 | if (err) { | |
607 | cache_destroy_net(cd, net); | |
608 | return err; | |
609 | } | |
610 | sn->unix_gid_cache = cd; | |
611 | return 0; | |
612 | } | |
613 | ||
614 | void unix_gid_cache_destroy(struct net *net) | |
615 | { | |
616 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
617 | struct cache_detail *cd = sn->unix_gid_cache; | |
618 | ||
619 | sn->unix_gid_cache = NULL; | |
620 | cache_purge(cd); | |
621 | cache_unregister_net(cd, net); | |
622 | cache_destroy_net(cd, net); | |
623 | } | |
624 | ||
7eaf040b | 625 | static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid) |
3fc605a2 N |
626 | { |
627 | struct unix_gid ug; | |
628 | struct cache_head *ch; | |
629 | ||
630 | ug.uid = uid; | |
fd5d2f78 | 631 | ch = sunrpc_cache_lookup_rcu(cd, &ug.h, unix_gid_hash(uid)); |
3fc605a2 N |
632 | if (ch) |
633 | return container_of(ch, struct unix_gid, h); | |
634 | else | |
635 | return NULL; | |
636 | } | |
637 | ||
7eaf040b | 638 | static struct group_info *unix_gid_find(kuid_t uid, struct svc_rqst *rqstp) |
3fc605a2 | 639 | { |
dc83d6e2 BF |
640 | struct unix_gid *ug; |
641 | struct group_info *gi; | |
642 | int ret; | |
73393232 SK |
643 | struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, |
644 | sunrpc_net_id); | |
dc83d6e2 | 645 | |
73393232 | 646 | ug = unix_gid_lookup(sn->unix_gid_cache, uid); |
3fc605a2 | 647 | if (!ug) |
dc83d6e2 | 648 | return ERR_PTR(-EAGAIN); |
73393232 | 649 | ret = cache_check(sn->unix_gid_cache, &ug->h, &rqstp->rq_chandle); |
dc83d6e2 | 650 | switch (ret) { |
3fc605a2 | 651 | case -ENOENT: |
dc83d6e2 | 652 | return ERR_PTR(-ENOENT); |
1ebede86 N |
653 | case -ETIMEDOUT: |
654 | return ERR_PTR(-ESHUTDOWN); | |
3fc605a2 | 655 | case 0: |
dc83d6e2 | 656 | gi = get_group_info(ug->gi); |
73393232 | 657 | cache_put(&ug->h, sn->unix_gid_cache); |
dc83d6e2 | 658 | return gi; |
3fc605a2 | 659 | default: |
dc83d6e2 | 660 | return ERR_PTR(-EAGAIN); |
3fc605a2 N |
661 | } |
662 | } | |
663 | ||
3ab4d8b1 | 664 | int |
1da177e4 LT |
665 | svcauth_unix_set_client(struct svc_rqst *rqstp) |
666 | { | |
f15364bd AC |
667 | struct sockaddr_in *sin; |
668 | struct sockaddr_in6 *sin6, sin6_storage; | |
1a9917c2 | 669 | struct ip_map *ipm; |
dc83d6e2 BF |
670 | struct group_info *gi; |
671 | struct svc_cred *cred = &rqstp->rq_cred; | |
3be4479f | 672 | struct svc_xprt *xprt = rqstp->rq_xprt; |
90d51b02 PE |
673 | struct net *net = xprt->xpt_net; |
674 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); | |
1da177e4 | 675 | |
f15364bd AC |
676 | switch (rqstp->rq_addr.ss_family) { |
677 | case AF_INET: | |
678 | sin = svc_addr_in(rqstp); | |
679 | sin6 = &sin6_storage; | |
b301e82c | 680 | ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &sin6->sin6_addr); |
f15364bd AC |
681 | break; |
682 | case AF_INET6: | |
683 | sin6 = svc_addr_in6(rqstp); | |
684 | break; | |
685 | default: | |
686 | BUG(); | |
687 | } | |
688 | ||
1da177e4 LT |
689 | rqstp->rq_client = NULL; |
690 | if (rqstp->rq_proc == 0) | |
691 | return SVC_OK; | |
692 | ||
3be4479f | 693 | ipm = ip_map_cached_get(xprt); |
7b2b1fee | 694 | if (ipm == NULL) |
90d51b02 | 695 | ipm = __ip_map_lookup(sn->ip_map_cache, rqstp->rq_server->sv_program->pg_class, |
f15364bd | 696 | &sin6->sin6_addr); |
1da177e4 LT |
697 | |
698 | if (ipm == NULL) | |
699 | return SVC_DENIED; | |
700 | ||
90d51b02 | 701 | switch (cache_check(sn->ip_map_cache, &ipm->h, &rqstp->rq_chandle)) { |
1da177e4 LT |
702 | default: |
703 | BUG(); | |
e0bb89ef | 704 | case -ETIMEDOUT: |
1ebede86 N |
705 | return SVC_CLOSE; |
706 | case -EAGAIN: | |
1da177e4 LT |
707 | return SVC_DROP; |
708 | case -ENOENT: | |
709 | return SVC_DENIED; | |
710 | case 0: | |
711 | rqstp->rq_client = &ipm->m_client->h; | |
efc36aa5 | 712 | kref_get(&rqstp->rq_client->ref); |
3be4479f | 713 | ip_map_cached_put(xprt, ipm); |
1da177e4 LT |
714 | break; |
715 | } | |
dc83d6e2 BF |
716 | |
717 | gi = unix_gid_find(cred->cr_uid, rqstp); | |
718 | switch (PTR_ERR(gi)) { | |
719 | case -EAGAIN: | |
720 | return SVC_DROP; | |
1ebede86 N |
721 | case -ESHUTDOWN: |
722 | return SVC_CLOSE; | |
dc83d6e2 BF |
723 | case -ENOENT: |
724 | break; | |
725 | default: | |
726 | put_group_info(cred->cr_group_info); | |
727 | cred->cr_group_info = gi; | |
728 | } | |
1da177e4 LT |
729 | return SVC_OK; |
730 | } | |
731 | ||
24c3767e | 732 | EXPORT_SYMBOL_GPL(svcauth_unix_set_client); |
3ab4d8b1 | 733 | |
1da177e4 | 734 | static int |
d8ed029d | 735 | svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp) |
1da177e4 LT |
736 | { |
737 | struct kvec *argv = &rqstp->rq_arg.head[0]; | |
738 | struct kvec *resv = &rqstp->rq_res.head[0]; | |
739 | struct svc_cred *cred = &rqstp->rq_cred; | |
740 | ||
1da177e4 LT |
741 | if (argv->iov_len < 3*4) |
742 | return SVC_GARBAGE; | |
743 | ||
cca5172a | 744 | if (svc_getu32(argv) != 0) { |
1da177e4 LT |
745 | dprintk("svc: bad null cred\n"); |
746 | *authp = rpc_autherr_badcred; | |
747 | return SVC_DENIED; | |
748 | } | |
76994313 | 749 | if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) { |
1da177e4 LT |
750 | dprintk("svc: bad null verf\n"); |
751 | *authp = rpc_autherr_badverf; | |
752 | return SVC_DENIED; | |
753 | } | |
754 | ||
755 | /* Signal that mapping to nobody uid/gid is required */ | |
bf37f794 EB |
756 | cred->cr_uid = INVALID_UID; |
757 | cred->cr_gid = INVALID_GID; | |
1da177e4 LT |
758 | cred->cr_group_info = groups_alloc(0); |
759 | if (cred->cr_group_info == NULL) | |
1ebede86 | 760 | return SVC_CLOSE; /* kmalloc failure - client must retry */ |
1da177e4 LT |
761 | |
762 | /* Put NULL verifier */ | |
76994313 AD |
763 | svc_putnl(resv, RPC_AUTH_NULL); |
764 | svc_putnl(resv, 0); | |
1da177e4 | 765 | |
d5497fc6 | 766 | rqstp->rq_cred.cr_flavor = RPC_AUTH_NULL; |
1da177e4 LT |
767 | return SVC_OK; |
768 | } | |
769 | ||
770 | static int | |
771 | svcauth_null_release(struct svc_rqst *rqstp) | |
772 | { | |
773 | if (rqstp->rq_client) | |
774 | auth_domain_put(rqstp->rq_client); | |
775 | rqstp->rq_client = NULL; | |
776 | if (rqstp->rq_cred.cr_group_info) | |
777 | put_group_info(rqstp->rq_cred.cr_group_info); | |
778 | rqstp->rq_cred.cr_group_info = NULL; | |
779 | ||
780 | return 0; /* don't drop */ | |
781 | } | |
782 | ||
783 | ||
784 | struct auth_ops svcauth_null = { | |
785 | .name = "null", | |
786 | .owner = THIS_MODULE, | |
787 | .flavour = RPC_AUTH_NULL, | |
788 | .accept = svcauth_null_accept, | |
789 | .release = svcauth_null_release, | |
790 | .set_client = svcauth_unix_set_client, | |
791 | }; | |
792 | ||
793 | ||
794 | static int | |
d8ed029d | 795 | svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp) |
1da177e4 LT |
796 | { |
797 | struct kvec *argv = &rqstp->rq_arg.head[0]; | |
798 | struct kvec *resv = &rqstp->rq_res.head[0]; | |
799 | struct svc_cred *cred = &rqstp->rq_cred; | |
ccfe51a5 | 800 | struct user_namespace *userns; |
1da177e4 LT |
801 | u32 slen, i; |
802 | int len = argv->iov_len; | |
803 | ||
1da177e4 LT |
804 | if ((len -= 3*4) < 0) |
805 | return SVC_GARBAGE; | |
806 | ||
807 | svc_getu32(argv); /* length */ | |
808 | svc_getu32(argv); /* time stamp */ | |
76994313 | 809 | slen = XDR_QUADLEN(svc_getnl(argv)); /* machname length */ |
1da177e4 LT |
810 | if (slen > 64 || (len -= (slen + 3)*4) < 0) |
811 | goto badcred; | |
d8ed029d | 812 | argv->iov_base = (void*)((__be32*)argv->iov_base + slen); /* skip machname */ |
1da177e4 | 813 | argv->iov_len -= slen*4; |
afe3c3fd BF |
814 | /* |
815 | * Note: we skip uid_valid()/gid_valid() checks here for | |
816 | * backwards compatibility with clients that use -1 id's. | |
817 | * Instead, -1 uid or gid is later mapped to the | |
818 | * (export-specific) anonymous id by nfsd_setuser. | |
819 | * Supplementary gid's will be left alone. | |
820 | */ | |
ccfe51a5 TM |
821 | userns = (rqstp->rq_xprt && rqstp->rq_xprt->xpt_cred) ? |
822 | rqstp->rq_xprt->xpt_cred->user_ns : &init_user_ns; | |
823 | cred->cr_uid = make_kuid(userns, svc_getnl(argv)); /* uid */ | |
824 | cred->cr_gid = make_kgid(userns, svc_getnl(argv)); /* gid */ | |
76994313 | 825 | slen = svc_getnl(argv); /* gids length */ |
5786461b | 826 | if (slen > UNX_NGROUPS || (len -= (slen + 2)*4) < 0) |
1da177e4 | 827 | goto badcred; |
dc83d6e2 BF |
828 | cred->cr_group_info = groups_alloc(slen); |
829 | if (cred->cr_group_info == NULL) | |
1ebede86 | 830 | return SVC_CLOSE; |
ae2975bc | 831 | for (i = 0; i < slen; i++) { |
ccfe51a5 | 832 | kgid_t kgid = make_kgid(userns, svc_getnl(argv)); |
81243eac | 833 | cred->cr_group_info->gid[i] = kgid; |
ae2975bc | 834 | } |
bdcf0a42 | 835 | groups_sort(cred->cr_group_info); |
76994313 | 836 | if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) { |
1da177e4 LT |
837 | *authp = rpc_autherr_badverf; |
838 | return SVC_DENIED; | |
839 | } | |
840 | ||
841 | /* Put NULL verifier */ | |
76994313 AD |
842 | svc_putnl(resv, RPC_AUTH_NULL); |
843 | svc_putnl(resv, 0); | |
1da177e4 | 844 | |
d5497fc6 | 845 | rqstp->rq_cred.cr_flavor = RPC_AUTH_UNIX; |
1da177e4 LT |
846 | return SVC_OK; |
847 | ||
848 | badcred: | |
849 | *authp = rpc_autherr_badcred; | |
850 | return SVC_DENIED; | |
851 | } | |
852 | ||
853 | static int | |
854 | svcauth_unix_release(struct svc_rqst *rqstp) | |
855 | { | |
856 | /* Verifier (such as it is) is already in place. | |
857 | */ | |
858 | if (rqstp->rq_client) | |
859 | auth_domain_put(rqstp->rq_client); | |
860 | rqstp->rq_client = NULL; | |
861 | if (rqstp->rq_cred.cr_group_info) | |
862 | put_group_info(rqstp->rq_cred.cr_group_info); | |
863 | rqstp->rq_cred.cr_group_info = NULL; | |
864 | ||
865 | return 0; | |
866 | } | |
867 | ||
868 | ||
869 | struct auth_ops svcauth_unix = { | |
870 | .name = "unix", | |
871 | .owner = THIS_MODULE, | |
872 | .flavour = RPC_AUTH_UNIX, | |
873 | .accept = svcauth_unix_accept, | |
874 | .release = svcauth_unix_release, | |
875 | .domain_release = svcauth_unix_domain_release, | |
876 | .set_client = svcauth_unix_set_client, | |
877 | }; | |
878 | ||
ee24eac3 | 879 | static const struct cache_detail ip_map_cache_template = { |
d05cc104 SK |
880 | .owner = THIS_MODULE, |
881 | .hash_size = IP_HASHMAX, | |
882 | .name = "auth.unix.ip", | |
883 | .cache_put = ip_map_put, | |
73fb847a | 884 | .cache_request = ip_map_request, |
d05cc104 SK |
885 | .cache_parse = ip_map_parse, |
886 | .cache_show = ip_map_show, | |
887 | .match = ip_map_match, | |
888 | .init = ip_map_init, | |
889 | .update = update, | |
890 | .alloc = ip_map_alloc, | |
891 | }; | |
892 | ||
90d51b02 PE |
893 | int ip_map_cache_create(struct net *net) |
894 | { | |
90d51b02 | 895 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
d05cc104 SK |
896 | struct cache_detail *cd; |
897 | int err; | |
90d51b02 | 898 | |
d05cc104 SK |
899 | cd = cache_create_net(&ip_map_cache_template, net); |
900 | if (IS_ERR(cd)) | |
901 | return PTR_ERR(cd); | |
90d51b02 | 902 | err = cache_register_net(cd, net); |
d05cc104 SK |
903 | if (err) { |
904 | cache_destroy_net(cd, net); | |
905 | return err; | |
906 | } | |
90d51b02 PE |
907 | sn->ip_map_cache = cd; |
908 | return 0; | |
90d51b02 PE |
909 | } |
910 | ||
911 | void ip_map_cache_destroy(struct net *net) | |
912 | { | |
d05cc104 SK |
913 | struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
914 | struct cache_detail *cd = sn->ip_map_cache; | |
90d51b02 | 915 | |
d05cc104 SK |
916 | sn->ip_map_cache = NULL; |
917 | cache_purge(cd); | |
918 | cache_unregister_net(cd, net); | |
919 | cache_destroy_net(cd, net); | |
90d51b02 | 920 | } |