Root/
1 | /* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> */ |
2 | |
3 | #include <linux/sched.h> |
4 | #include "nfsd.h" |
5 | #include "auth.h" |
6 | |
7 | int nfsexp_flags(struct svc_rqst *rqstp, struct svc_export *exp) |
8 | { |
9 | struct exp_flavor_info *f; |
10 | struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors; |
11 | |
12 | for (f = exp->ex_flavors; f < end; f++) { |
13 | if (f->pseudoflavor == rqstp->rq_flavor) |
14 | return f->flags; |
15 | } |
16 | return exp->ex_flags; |
17 | |
18 | } |
19 | |
20 | int nfsd_setuser(struct svc_rqst *rqstp, struct svc_export *exp) |
21 | { |
22 | struct group_info *rqgi; |
23 | struct group_info *gi; |
24 | struct cred *new; |
25 | int i; |
26 | int flags = nfsexp_flags(rqstp, exp); |
27 | int ret; |
28 | |
29 | validate_process_creds(); |
30 | |
31 | /* discard any old override before preparing the new set */ |
32 | revert_creds(get_cred(current->real_cred)); |
33 | new = prepare_creds(); |
34 | if (!new) |
35 | return -ENOMEM; |
36 | |
37 | new->fsuid = rqstp->rq_cred.cr_uid; |
38 | new->fsgid = rqstp->rq_cred.cr_gid; |
39 | |
40 | rqgi = rqstp->rq_cred.cr_group_info; |
41 | |
42 | if (flags & NFSEXP_ALLSQUASH) { |
43 | new->fsuid = exp->ex_anon_uid; |
44 | new->fsgid = exp->ex_anon_gid; |
45 | gi = groups_alloc(0); |
46 | if (!gi) |
47 | goto oom; |
48 | } else if (flags & NFSEXP_ROOTSQUASH) { |
49 | if (!new->fsuid) |
50 | new->fsuid = exp->ex_anon_uid; |
51 | if (!new->fsgid) |
52 | new->fsgid = exp->ex_anon_gid; |
53 | |
54 | gi = groups_alloc(rqgi->ngroups); |
55 | if (!gi) |
56 | goto oom; |
57 | |
58 | for (i = 0; i < rqgi->ngroups; i++) { |
59 | if (!GROUP_AT(rqgi, i)) |
60 | GROUP_AT(gi, i) = exp->ex_anon_gid; |
61 | else |
62 | GROUP_AT(gi, i) = GROUP_AT(rqgi, i); |
63 | } |
64 | } else { |
65 | gi = get_group_info(rqgi); |
66 | } |
67 | |
68 | if (new->fsuid == (uid_t) -1) |
69 | new->fsuid = exp->ex_anon_uid; |
70 | if (new->fsgid == (gid_t) -1) |
71 | new->fsgid = exp->ex_anon_gid; |
72 | |
73 | ret = set_groups(new, gi); |
74 | put_group_info(gi); |
75 | if (ret < 0) |
76 | goto error; |
77 | |
78 | if (new->fsuid) |
79 | new->cap_effective = cap_drop_nfsd_set(new->cap_effective); |
80 | else |
81 | new->cap_effective = cap_raise_nfsd_set(new->cap_effective, |
82 | new->cap_permitted); |
83 | validate_process_creds(); |
84 | put_cred(override_creds(new)); |
85 | put_cred(new); |
86 | validate_process_creds(); |
87 | return 0; |
88 | |
89 | oom: |
90 | ret = -ENOMEM; |
91 | error: |
92 | abort_creds(new); |
93 | return ret; |
94 | } |
95 | |
96 |
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Tags:
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od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
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v3.9