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