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-rw-r--r--fs/nfsd/auth.c63
1 files changed, 63 insertions, 0 deletions
diff --git a/fs/nfsd/auth.c b/fs/nfsd/auth.c
new file mode 100644
index 0000000..cfe9ce8
--- /dev/null
+++ b/fs/nfsd/auth.c
@@ -0,0 +1,63 @@
+/*
+ * linux/fs/nfsd/auth.c
+ *
+ * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/sunrpc/svc.h>
+#include <linux/sunrpc/svcauth.h>
+#include <linux/nfsd/nfsd.h>
+
+#define CAP_NFSD_MASK (CAP_FS_MASK|CAP_TO_MASK(CAP_SYS_RESOURCE))
+
+int nfsd_setuser(struct svc_rqst *rqstp, struct svc_export *exp)
+{
+ struct svc_cred *cred = &rqstp->rq_cred;
+ int i;
+ int ret;
+
+ if (exp->ex_flags & NFSEXP_ALLSQUASH) {
+ cred->cr_uid = exp->ex_anon_uid;
+ cred->cr_gid = exp->ex_anon_gid;
+ put_group_info(cred->cr_group_info);
+ cred->cr_group_info = groups_alloc(0);
+ } else if (exp->ex_flags & NFSEXP_ROOTSQUASH) {
+ struct group_info *gi;
+ if (!cred->cr_uid)
+ cred->cr_uid = exp->ex_anon_uid;
+ if (!cred->cr_gid)
+ cred->cr_gid = exp->ex_anon_gid;
+ gi = groups_alloc(cred->cr_group_info->ngroups);
+ if (gi)
+ for (i = 0; i < cred->cr_group_info->ngroups; i++) {
+ if (!GROUP_AT(cred->cr_group_info, i))
+ GROUP_AT(gi, i) = exp->ex_anon_gid;
+ else
+ GROUP_AT(gi, i) = GROUP_AT(cred->cr_group_info, i);
+ }
+ put_group_info(cred->cr_group_info);
+ cred->cr_group_info = gi;
+ }
+
+ if (cred->cr_uid != (uid_t) -1)
+ current->fsuid = cred->cr_uid;
+ else
+ current->fsuid = exp->ex_anon_uid;
+ if (cred->cr_gid != (gid_t) -1)
+ current->fsgid = cred->cr_gid;
+ else
+ current->fsgid = exp->ex_anon_gid;
+
+ if (!cred->cr_group_info)
+ return -ENOMEM;
+ ret = set_current_groups(cred->cr_group_info);
+ if ((cred->cr_uid)) {
+ cap_t(current->cap_effective) &= ~CAP_NFSD_MASK;
+ } else {
+ cap_t(current->cap_effective) |= (CAP_NFSD_MASK &
+ current->cap_permitted);
+ }
+ return ret;
+}
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