diff options
| author | J. Bruce Fields <bfields@citi.umich.edu> | 2007-07-17 04:04:52 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-17 10:23:08 -0700 |
| commit | 1269bc69b6649282091bb7007372acf4ab8357fd (patch) | |
| tree | 58cd434f7381332dd8b7331da36f98b40cb69639 | |
| parent | 9091224f3cff4721f295df29e8a99705a63bc4c7 (diff) | |
knfsd: nfsd: enforce per-flavor id squashing
Allow root squashing to vary per-pseudoflavor, so that you can (for example)
allow root access only when sufficiently strong security is in use.
Signed-off-by: "J. Bruce Fields" <bfields@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/nfsd/auth.c | 18 | ||||
| -rw-r--r-- | include/linux/nfsd/export.h | 3 |
2 files changed, 18 insertions, 3 deletions
diff --git a/fs/nfsd/auth.c b/fs/nfsd/auth.c index 6e92b0fe532..cf61dc8ae94 100644 --- a/fs/nfsd/auth.c +++ b/fs/nfsd/auth.c @@ -12,17 +12,31 @@ #define CAP_NFSD_MASK (CAP_FS_MASK|CAP_TO_MASK(CAP_SYS_RESOURCE)) +static int nfsexp_flags(struct svc_rqst *rqstp, struct svc_export *exp) +{ + struct exp_flavor_info *f; + struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors; + + for (f = exp->ex_flavors; f < end; f++) { + if (f->pseudoflavor == rqstp->rq_flavor) + return f->flags; + } + return exp->ex_flags; + +} + int nfsd_setuser(struct svc_rqst *rqstp, struct svc_export *exp) { struct svc_cred cred = rqstp->rq_cred; int i; + int flags = nfsexp_flags(rqstp, exp); int ret; - if (exp->ex_flags & NFSEXP_ALLSQUASH) { + if (flags & NFSEXP_ALLSQUASH) { cred.cr_uid = exp->ex_anon_uid; cred.cr_gid = exp->ex_anon_gid; cred.cr_group_info = groups_alloc(0); - } else if (exp->ex_flags & NFSEXP_ROOTSQUASH) { + } else if (flags & NFSEXP_ROOTSQUASH) { struct group_info *gi; if (!cred.cr_uid) cred.cr_uid = exp->ex_anon_uid; diff --git a/include/linux/nfsd/export.h b/include/linux/nfsd/export.h index a01f775cb94..78feb7beff7 100644 --- a/include/linux/nfsd/export.h +++ b/include/linux/nfsd/export.h @@ -43,7 +43,8 @@ #define NFSEXP_ALLFLAGS 0xFE3F /* The flags that may vary depending on security flavor: */ -#define NFSEXP_SECINFO_FLAGS 0 +#define NFSEXP_SECINFO_FLAGS (NFSEXP_READONLY | NFSEXP_ROOTSQUASH \ + | NFSEXP_ALLSQUASH) #ifdef __KERNEL__ |