7008be5bd7
in the future in a backward compatible (API and ABI) way.
The cap_rights_t represents capability rights. We used to use one bit to
represent one right, but we are running out of spare bits. Currently the new
structure provides place for 114 rights (so 50 more than the previous
cap_rights_t), but it is possible to grow the structure to hold at least 285
rights, although we can make it even larger if 285 rights won't be enough.
The structure definition looks like this:
struct cap_rights {
uint64_t cr_rights[CAP_RIGHTS_VERSION + 2];
};
The initial CAP_RIGHTS_VERSION is 0.
The top two bits in the first element of the cr_rights[] array contain total
number of elements in the array - 2. This means if those two bits are equal to
0, we have 2 array elements.
The top two bits in all remaining array elements should be 0.
The next five bits in all array elements contain array index. Only one bit is
used and bit position in this five-bits range defines array index. This means
there can be at most five array elements in the future.
To define new right the CAPRIGHT() macro must be used. The macro takes two
arguments - an array index and a bit to set, eg.
#define CAP_PDKILL CAPRIGHT(1, 0x0000000000000800ULL)
We still support aliases that combine few rights, but the rights have to belong
to the same array element, eg:
#define CAP_LOOKUP CAPRIGHT(0, 0x0000000000000400ULL)
#define CAP_FCHMOD CAPRIGHT(0, 0x0000000000002000ULL)
#define CAP_FCHMODAT (CAP_FCHMOD | CAP_LOOKUP)
There is new API to manage the new cap_rights_t structure:
cap_rights_t *cap_rights_init(cap_rights_t *rights, ...);
void cap_rights_set(cap_rights_t *rights, ...);
void cap_rights_clear(cap_rights_t *rights, ...);
bool cap_rights_is_set(const cap_rights_t *rights, ...);
bool cap_rights_is_valid(const cap_rights_t *rights);
void cap_rights_merge(cap_rights_t *dst, const cap_rights_t *src);
void cap_rights_remove(cap_rights_t *dst, const cap_rights_t *src);
bool cap_rights_contains(const cap_rights_t *big, const cap_rights_t *little);
Capability rights to the cap_rights_init(), cap_rights_set(),
cap_rights_clear() and cap_rights_is_set() functions are provided by
separating them with commas, eg:
cap_rights_t rights;
cap_rights_init(&rights, CAP_READ, CAP_WRITE, CAP_FSTAT);
There is no need to terminate the list of rights, as those functions are
actually macros that take care of the termination, eg:
#define cap_rights_set(rights, ...) \
__cap_rights_set((rights), __VA_ARGS__, 0ULL)
void __cap_rights_set(cap_rights_t *rights, ...);
Thanks to using one bit as an array index we can assert in those functions that
there are no two rights belonging to different array elements provided
together. For example this is illegal and will be detected, because CAP_LOOKUP
belongs to element 0 and CAP_PDKILL to element 1:
cap_rights_init(&rights, CAP_LOOKUP | CAP_PDKILL);
Providing several rights that belongs to the same array's element this way is
correct, but is not advised. It should only be used for aliases definition.
This commit also breaks compatibility with some existing Capsicum system calls,
but I see no other way to do that. This should be fine as Capsicum is still
experimental and this change is not going to 9.x.
Sponsored by: The FreeBSD Foundation
545 lines
13 KiB
C
545 lines
13 KiB
C
/*-
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Rick Macklem at The University of Guelph.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)nfs_syscalls.c 8.5 (Berkeley) 3/30/95
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_inet6.h"
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#include "opt_kgssapi.h"
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#include <sys/param.h>
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#include <sys/capability.h>
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#include <sys/systm.h>
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#include <sys/sysproto.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.h>
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#include <sys/file.h>
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#include <sys/filedesc.h>
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#include <sys/jail.h>
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#include <sys/vnode.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/bio.h>
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#include <sys/buf.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/domain.h>
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#include <sys/protosw.h>
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#include <sys/namei.h>
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#include <sys/fcntl.h>
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#include <sys/lockf.h>
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#include <sys/eventhandler.h>
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#include <netinet/in.h>
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#include <netinet/tcp.h>
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#ifdef INET6
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#include <net/if.h>
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#include <netinet6/in6_var.h>
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#endif
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#include <rpc/rpc.h>
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#include <rpc/rpcsec_gss.h>
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#include <rpc/replay.h>
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#include <nfs/xdr_subs.h>
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#include <nfs/nfsproto.h>
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#include <nfs/nfs_fha.h>
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#include <nfsserver/nfs.h>
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#include <nfsserver/nfsm_subs.h>
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#include <nfsserver/nfsrvcache.h>
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#include <nfsserver/nfs_fha_old.h>
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#include <security/mac/mac_framework.h>
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static MALLOC_DEFINE(M_NFSSVC, "nfss_srvsock", "Nfs server structure");
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MALLOC_DEFINE(M_NFSRVDESC, "nfss_srvdesc", "NFS server socket descriptor");
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MALLOC_DEFINE(M_NFSD, "nfss_daemon", "Nfs server daemon structure");
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#define TRUE 1
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#define FALSE 0
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SYSCTL_DECL(_vfs_nfsrv);
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SVCPOOL *nfsrv_pool;
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int nfsd_waiting = 0;
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int nfsrv_numnfsd = 0;
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struct callout nfsrv_callout;
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static eventhandler_tag nfsrv_nmbclusters_tag;
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static int nfs_privport = 0;
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SYSCTL_INT(_vfs_nfsrv, NFS_NFSPRIVPORT, nfs_privport, CTLFLAG_RW,
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&nfs_privport, 0,
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"Only allow clients using a privileged port");
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SYSCTL_INT(_vfs_nfsrv, OID_AUTO, gatherdelay, CTLFLAG_RW,
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&nfsrvw_procrastinate, 0,
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"Delay value for write gathering");
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SYSCTL_INT(_vfs_nfsrv, OID_AUTO, gatherdelay_v3, CTLFLAG_RW,
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&nfsrvw_procrastinate_v3, 0,
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"Delay in seconds for NFSv3 write gathering");
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static int nfssvc_addsock(struct file *, struct thread *);
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static int nfssvc_nfsd(struct thread *, struct nfsd_nfsd_args *);
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extern u_long sb_max_adj;
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int32_t (*nfsrv3_procs[NFS_NPROCS])(struct nfsrv_descript *nd,
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struct nfssvc_sock *slp, struct mbuf **mreqp) = {
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nfsrv_null,
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nfsrv_getattr,
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nfsrv_setattr,
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nfsrv_lookup,
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nfsrv3_access,
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nfsrv_readlink,
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nfsrv_read,
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nfsrv_write,
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nfsrv_create,
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nfsrv_mkdir,
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nfsrv_symlink,
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nfsrv_mknod,
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nfsrv_remove,
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nfsrv_rmdir,
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nfsrv_rename,
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nfsrv_link,
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nfsrv_readdir,
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nfsrv_readdirplus,
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nfsrv_statfs,
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nfsrv_fsinfo,
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nfsrv_pathconf,
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nfsrv_commit,
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nfsrv_noop
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};
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/*
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* NFS server system calls
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*/
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/*
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* This is now called from nfssvc() in nfs/nfs_nfssvc.c.
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*/
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/*
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* Nfs server psuedo system call for the nfsd's
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* Based on the flag value it either:
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* - adds a socket to the selection list
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* - remains in the kernel as an nfsd
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* - remains in the kernel as an nfsiod
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* For INET6 we suppose that nfsd provides only IN6P_IPV6_V6ONLY sockets
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* and that mountd provides
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* - sockaddr with no IPv4-mapped addresses
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* - mask for both INET and INET6 families if there is IPv4-mapped overlap
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*/
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int
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nfssvc_nfsserver(struct thread *td, struct nfssvc_args *uap)
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{
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struct file *fp;
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struct nfsd_addsock_args addsockarg;
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struct nfsd_nfsd_args nfsdarg;
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cap_rights_t rights;
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int error;
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if (uap->flag & NFSSVC_ADDSOCK) {
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error = copyin(uap->argp, (caddr_t)&addsockarg,
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sizeof(addsockarg));
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if (error)
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return (error);
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error = fget(td, addsockarg.sock,
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cap_rights_init(&rights, CAP_SOCK_SERVER), &fp);
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if (error)
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return (error);
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if (fp->f_type != DTYPE_SOCKET) {
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fdrop(fp, td);
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return (error); /* XXXRW: Should be EINVAL? */
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}
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error = nfssvc_addsock(fp, td);
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fdrop(fp, td);
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} else if (uap->flag & NFSSVC_OLDNFSD)
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error = nfssvc_nfsd(td, NULL);
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else if (uap->flag & NFSSVC_NFSD) {
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if (!uap->argp)
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return (EINVAL);
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error = copyin(uap->argp, (caddr_t)&nfsdarg,
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sizeof(nfsdarg));
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if (error)
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return (error);
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error = nfssvc_nfsd(td, &nfsdarg);
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} else
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error = ENXIO;
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return (error);
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}
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/*
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* Generate the rpc reply header
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* siz arg. is used to decide if adding a cluster is worthwhile
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*/
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struct mbuf *
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nfs_rephead(int siz, struct nfsrv_descript *nd, int err,
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struct mbuf **mbp, caddr_t *bposp)
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{
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u_int32_t *tl;
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struct mbuf *mreq;
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caddr_t bpos;
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struct mbuf *mb;
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if (err == EBADRPC)
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return (NULL);
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nd->nd_repstat = err;
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if (err && (nd->nd_flag & ND_NFSV3) == 0) /* XXX recheck */
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siz = 0;
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MGET(mreq, M_WAITOK, MT_DATA);
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/*
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* If this is a big reply, use a cluster
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*/
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mreq->m_len = 0;
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if (siz >= MINCLSIZE) {
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MCLGET(mreq, M_WAITOK);
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}
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mb = mreq;
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bpos = mtod(mb, caddr_t);
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if (err != NFSERR_RETVOID) {
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tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED);
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if (err)
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*tl = txdr_unsigned(nfsrv_errmap(nd, err));
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else
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*tl = 0;
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}
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*mbp = mb;
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*bposp = bpos;
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if (err != 0 && err != NFSERR_RETVOID)
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nfsrvstats.srvrpc_errs++;
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return (mreq);
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}
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static void
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nfssvc_program(struct svc_req *rqst, SVCXPRT *xprt)
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{
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rpcproc_t procnum;
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int32_t (*proc)(struct nfsrv_descript *nd, struct nfssvc_sock *slp,
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struct mbuf **mreqp);
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int flag;
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struct nfsrv_descript nd;
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struct mbuf *mreq, *mrep;
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int error;
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if (rqst->rq_vers == NFS_VER2) {
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if (rqst->rq_proc > NFSV2PROC_STATFS) {
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svcerr_noproc(rqst);
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svc_freereq(rqst);
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return;
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}
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procnum = nfsrv_nfsv3_procid[rqst->rq_proc];
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flag = 0;
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} else {
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if (rqst->rq_proc >= NFS_NPROCS) {
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svcerr_noproc(rqst);
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svc_freereq(rqst);
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return;
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}
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procnum = rqst->rq_proc;
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flag = ND_NFSV3;
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}
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proc = nfsrv3_procs[procnum];
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mreq = mrep = NULL;
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mreq = rqst->rq_args;
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rqst->rq_args = NULL;
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(void)nfs_realign(&mreq, M_WAITOK);
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/*
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* Note: we want rq_addr, not svc_getrpccaller for nd_nam2 -
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* NFS_SRVMAXDATA uses a NULL value for nd_nam2 to detect TCP
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* mounts.
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*/
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memset(&nd, 0, sizeof(nd));
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nd.nd_md = nd.nd_mrep = mreq;
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nd.nd_dpos = mtod(mreq, caddr_t);
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nd.nd_nam = svc_getrpccaller(rqst);
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nd.nd_nam2 = rqst->rq_addr;
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nd.nd_procnum = procnum;
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nd.nd_cr = NULL;
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nd.nd_flag = flag;
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if (nfs_privport) {
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/* Check if source port is privileged */
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u_short port;
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struct sockaddr *nam = nd.nd_nam;
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struct sockaddr_in *sin;
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sin = (struct sockaddr_in *)nam;
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/*
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* INET/INET6 - same code:
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* sin_port and sin6_port are at same offset
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*/
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port = ntohs(sin->sin_port);
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if (port >= IPPORT_RESERVED &&
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nd.nd_procnum != NFSPROC_NULL) {
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#ifdef INET6
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char b6[INET6_ADDRSTRLEN];
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#if defined(KLD_MODULE)
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/* Do not use ip6_sprintf: the nfs module should work without INET6. */
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#define ip6_sprintf(buf, a) \
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(sprintf((buf), "%x:%x:%x:%x:%x:%x:%x:%x", \
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(a)->s6_addr16[0], (a)->s6_addr16[1], \
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(a)->s6_addr16[2], (a)->s6_addr16[3], \
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(a)->s6_addr16[4], (a)->s6_addr16[5], \
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(a)->s6_addr16[6], (a)->s6_addr16[7]), \
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(buf))
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#endif
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#endif
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printf("NFS request from unprivileged port (%s:%d)\n",
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#ifdef INET6
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sin->sin_family == AF_INET6 ?
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ip6_sprintf(b6, &satosin6(sin)->sin6_addr) :
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#if defined(KLD_MODULE)
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#undef ip6_sprintf
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#endif
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#endif
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inet_ntoa(sin->sin_addr), port);
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m_freem(mreq);
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svcerr_weakauth(rqst);
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svc_freereq(rqst);
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return;
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}
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}
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if (proc != nfsrv_null) {
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if (!svc_getcred(rqst, &nd.nd_cr, &nd.nd_credflavor)) {
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m_freem(mreq);
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svcerr_weakauth(rqst);
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svc_freereq(rqst);
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return;
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}
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#ifdef MAC
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mac_cred_associate_nfsd(nd.nd_cr);
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#endif
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}
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nfsrvstats.srvrpccnt[nd.nd_procnum]++;
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error = proc(&nd, NULL, &mrep);
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if (nd.nd_cr)
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crfree(nd.nd_cr);
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if (mrep == NULL) {
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svcerr_decode(rqst);
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svc_freereq(rqst);
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return;
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}
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if (error && error != NFSERR_RETVOID) {
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svcerr_systemerr(rqst);
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svc_freereq(rqst);
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return;
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}
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if (nd.nd_repstat & NFSERR_AUTHERR) {
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svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR);
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m_freem(mrep);
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} else {
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if (!svc_sendreply_mbuf(rqst, mrep))
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svcerr_systemerr(rqst);
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}
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svc_freereq(rqst);
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}
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/*
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* Adds a socket to the list for servicing by nfsds.
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*/
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static int
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nfssvc_addsock(struct file *fp, struct thread *td)
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{
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int siz;
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struct socket *so;
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int error;
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SVCXPRT *xprt;
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so = fp->f_data;
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siz = sb_max_adj;
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error = soreserve(so, siz, siz);
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if (error)
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return (error);
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/*
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* Steal the socket from userland so that it doesn't close
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* unexpectedly.
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*/
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if (so->so_type == SOCK_DGRAM)
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xprt = svc_dg_create(nfsrv_pool, so, 0, 0);
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else
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xprt = svc_vc_create(nfsrv_pool, so, 0, 0);
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if (xprt) {
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fp->f_ops = &badfileops;
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fp->f_data = NULL;
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svc_reg(xprt, NFS_PROG, NFS_VER2, nfssvc_program, NULL);
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svc_reg(xprt, NFS_PROG, NFS_VER3, nfssvc_program, NULL);
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SVC_RELEASE(xprt);
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}
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return (0);
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}
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/*
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* Called by nfssvc() for nfsds. Just loops around servicing rpc requests
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* until it is killed by a signal.
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*/
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static int
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nfssvc_nfsd(struct thread *td, struct nfsd_nfsd_args *args)
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{
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char principal[128];
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int error;
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if (args) {
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error = copyinstr(args->principal, principal,
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sizeof(principal), NULL);
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|
if (error)
|
|
return (error);
|
|
} else {
|
|
memcpy(principal, "nfs@", 4);
|
|
getcredhostname(td->td_ucred, principal + 4,
|
|
sizeof(principal) - 4);
|
|
}
|
|
|
|
/*
|
|
* Only the first nfsd actually does any work. The RPC code
|
|
* adds threads to it as needed. Any extra processes offered
|
|
* by nfsd just exit. If nfsd is new enough, it will call us
|
|
* once with a structure that specifies how many threads to
|
|
* use.
|
|
*/
|
|
NFSD_LOCK();
|
|
if (nfsrv_numnfsd == 0) {
|
|
nfsrv_numnfsd++;
|
|
|
|
NFSD_UNLOCK();
|
|
|
|
rpc_gss_set_svc_name_call(principal, "kerberosv5",
|
|
GSS_C_INDEFINITE, NFS_PROG, NFS_VER2);
|
|
rpc_gss_set_svc_name_call(principal, "kerberosv5",
|
|
GSS_C_INDEFINITE, NFS_PROG, NFS_VER3);
|
|
|
|
if (args) {
|
|
nfsrv_pool->sp_minthreads = args->minthreads;
|
|
nfsrv_pool->sp_maxthreads = args->maxthreads;
|
|
} else {
|
|
nfsrv_pool->sp_minthreads = 4;
|
|
nfsrv_pool->sp_maxthreads = 4;
|
|
}
|
|
|
|
svc_run(nfsrv_pool);
|
|
|
|
rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER2);
|
|
rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER3);
|
|
|
|
NFSD_LOCK();
|
|
nfsrv_numnfsd--;
|
|
nfsrv_init(TRUE);
|
|
}
|
|
NFSD_UNLOCK();
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Size the NFS server's duplicate request cache at 1/2 the
|
|
* nmbclusters, floating within a (64, 2048) range. This is to
|
|
* prevent all mbuf clusters being tied up in the NFS dupreq
|
|
* cache for small values of nmbclusters.
|
|
*/
|
|
static size_t
|
|
nfsrv_replay_size(void)
|
|
{
|
|
size_t replaysiz;
|
|
|
|
replaysiz = nmbclusters / 2;
|
|
if (replaysiz > NFSRVCACHE_MAX_SIZE)
|
|
replaysiz = NFSRVCACHE_MAX_SIZE;
|
|
if (replaysiz < NFSRVCACHE_MIN_SIZE)
|
|
replaysiz = NFSRVCACHE_MIN_SIZE;
|
|
replaysiz *= MCLBYTES;
|
|
|
|
return (replaysiz);
|
|
}
|
|
|
|
/*
|
|
* Called when nmbclusters changes - we resize the replay cache
|
|
* accordingly.
|
|
*/
|
|
static void
|
|
nfsrv_nmbclusters_change(void *tag)
|
|
{
|
|
|
|
if (nfsrv_pool)
|
|
replay_setsize(nfsrv_pool->sp_rcache, nfsrv_replay_size());
|
|
}
|
|
|
|
/*
|
|
* Initialize the data structures for the server.
|
|
* Handshake with any new nfsds starting up to avoid any chance of
|
|
* corruption.
|
|
*/
|
|
void
|
|
nfsrv_init(int terminating)
|
|
{
|
|
|
|
NFSD_LOCK_ASSERT();
|
|
|
|
if (terminating) {
|
|
NFSD_UNLOCK();
|
|
EVENTHANDLER_DEREGISTER(nmbclusters_change,
|
|
nfsrv_nmbclusters_tag);
|
|
svcpool_destroy(nfsrv_pool);
|
|
nfsrv_pool = NULL;
|
|
NFSD_LOCK();
|
|
} else
|
|
nfs_pub.np_valid = 0;
|
|
|
|
NFSD_UNLOCK();
|
|
|
|
nfsrv_pool = svcpool_create("nfsd", SYSCTL_STATIC_CHILDREN(_vfs_nfsrv));
|
|
nfsrv_pool->sp_rcache = replay_newcache(nfsrv_replay_size());
|
|
nfsrv_pool->sp_assign = fhaold_assign;
|
|
nfsrv_pool->sp_done = fha_nd_complete;
|
|
nfsrv_nmbclusters_tag = EVENTHANDLER_REGISTER(nmbclusters_change,
|
|
nfsrv_nmbclusters_change, NULL, EVENTHANDLER_PRI_FIRST);
|
|
|
|
NFSD_LOCK();
|
|
}
|