Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/nfsd/auth.c | |
3 | * | |
4 | * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> | |
5 | */ | |
6 | ||
7 | #include <linux/types.h> | |
8 | #include <linux/sched.h> | |
9 | #include <linux/sunrpc/svc.h> | |
10 | #include <linux/sunrpc/svcauth.h> | |
11 | #include <linux/nfsd/nfsd.h> | |
c7d51402 | 12 | #include <linux/nfsd/export.h> |
a254b246 | 13 | #include "auth.h" |
1da177e4 | 14 | |
c7d51402 | 15 | int nfsexp_flags(struct svc_rqst *rqstp, struct svc_export *exp) |
1269bc69 BF |
16 | { |
17 | struct exp_flavor_info *f; | |
18 | struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors; | |
19 | ||
20 | for (f = exp->ex_flavors; f < end; f++) { | |
21 | if (f->pseudoflavor == rqstp->rq_flavor) | |
22 | return f->flags; | |
23 | } | |
24 | return exp->ex_flags; | |
25 | ||
26 | } | |
27 | ||
1da177e4 LT |
28 | int nfsd_setuser(struct svc_rqst *rqstp, struct svc_export *exp) |
29 | { | |
d84f4f99 DH |
30 | struct group_info *rqgi; |
31 | struct group_info *gi; | |
32 | struct cred *new; | |
1da177e4 | 33 | int i; |
1269bc69 | 34 | int flags = nfsexp_flags(rqstp, exp); |
1da177e4 LT |
35 | int ret; |
36 | ||
e0e81739 DH |
37 | validate_process_creds(); |
38 | ||
3b11a1de DH |
39 | /* discard any old override before preparing the new set */ |
40 | revert_creds(get_cred(current->real_cred)); | |
d84f4f99 DH |
41 | new = prepare_creds(); |
42 | if (!new) | |
43 | return -ENOMEM; | |
44 | ||
45 | new->fsuid = rqstp->rq_cred.cr_uid; | |
46 | new->fsgid = rqstp->rq_cred.cr_gid; | |
47 | ||
48 | rqgi = rqstp->rq_cred.cr_group_info; | |
49 | ||
1269bc69 | 50 | if (flags & NFSEXP_ALLSQUASH) { |
d84f4f99 DH |
51 | new->fsuid = exp->ex_anon_uid; |
52 | new->fsgid = exp->ex_anon_gid; | |
53 | gi = groups_alloc(0); | |
bf935a78 BF |
54 | if (!gi) |
55 | goto oom; | |
1269bc69 | 56 | } else if (flags & NFSEXP_ROOTSQUASH) { |
d84f4f99 DH |
57 | if (!new->fsuid) |
58 | new->fsuid = exp->ex_anon_uid; | |
59 | if (!new->fsgid) | |
60 | new->fsgid = exp->ex_anon_gid; | |
1da177e4 | 61 | |
d84f4f99 DH |
62 | gi = groups_alloc(rqgi->ngroups); |
63 | if (!gi) | |
64 | goto oom; | |
65 | ||
66 | for (i = 0; i < rqgi->ngroups; i++) { | |
67 | if (!GROUP_AT(rqgi, i)) | |
68 | GROUP_AT(gi, i) = exp->ex_anon_gid; | |
69 | else | |
70 | GROUP_AT(gi, i) = GROUP_AT(rqgi, i); | |
71 | } | |
1da177e4 | 72 | } else { |
d84f4f99 | 73 | gi = get_group_info(rqgi); |
1da177e4 | 74 | } |
d84f4f99 DH |
75 | |
76 | if (new->fsuid == (uid_t) -1) | |
77 | new->fsuid = exp->ex_anon_uid; | |
78 | if (new->fsgid == (gid_t) -1) | |
79 | new->fsgid = exp->ex_anon_gid; | |
80 | ||
81 | ret = set_groups(new, gi); | |
82 | put_group_info(gi); | |
f05ef8db | 83 | if (ret < 0) |
d84f4f99 DH |
84 | goto error; |
85 | ||
f05ef8db | 86 | if (new->fsuid) |
d84f4f99 DH |
87 | new->cap_effective = cap_drop_nfsd_set(new->cap_effective); |
88 | else | |
89 | new->cap_effective = cap_raise_nfsd_set(new->cap_effective, | |
90 | new->cap_permitted); | |
e0e81739 | 91 | validate_process_creds(); |
3b11a1de | 92 | put_cred(override_creds(new)); |
b914152a | 93 | put_cred(new); |
e0e81739 | 94 | validate_process_creds(); |
3b11a1de | 95 | return 0; |
d84f4f99 DH |
96 | |
97 | oom: | |
98 | ret = -ENOMEM; | |
99 | error: | |
100 | abort_creds(new); | |
1da177e4 LT |
101 | return ret; |
102 | } | |
b6dff3ec | 103 |