2 * Copyright 2000, International Business Machines Corporation and others.
5 * This software has been released under the terms of the IBM Public
6 * License. For details, see the LICENSE file in the top-level source
7 * directory or online at http://www.openafs.org/dl/license10.html
11 * afs_vnop_access.c - access vop ccess mode bit support for vnode operations.
22 #include <afsconfig.h>
23 #include "afs/param.h"
27 #include "afs/sysincludes.h" /* Standard vendor system headers */
28 #include "afsincludes.h" /* Afs-based standard headers */
29 #include "afs/afs_stats.h" /* statistics */
30 #include "afs/afs_cbqueue.h"
31 #include "afs/nfsclient.h"
32 #include "afs/afs_osidnlc.h"
35 #define ANONYMOUSID 32766 /* make sure this is same as in ptserver.h */
41 /* access bits to turn off for various owner Unix mode values */
42 static char fileModeMap[8] = {
43 PRSFS_READ | PRSFS_WRITE,
44 PRSFS_READ | PRSFS_WRITE,
53 /* avc must be held. Returns bit map of mode bits. Ignores file mode bits */
54 afs_int32 afs_GetAccessBits(register struct vcache *avc, register afs_int32 arights,
55 register struct vrequest *areq)
57 AFS_STATCNT(afs_GetAccessBits);
58 /* see if anyuser has the required access bits */
59 if ((arights & avc->anyAccess) == arights) {
63 /* look in per-pag cache */
64 if (avc->Access) { /* not beautiful, but Sun's cc will tolerate it */
67 ac = afs_FindAxs(avc->Access, areq->uid);
69 return (arights & ac->axess);
73 if (!(avc->states & CForeign)) {
74 /* If there aren't any bits cached for this user (but the vnode
75 * _is_ cached, obviously), make sure this user has valid tokens
76 * before bothering with the RPC. */
78 extern struct unixuser *afs_FindUser();
79 tu = afs_FindUser( areq->uid, avc->fid.Cell, READ_LOCK );
81 return (arights & avc->anyAccess);
83 if ((tu->vid == UNDEFVID) || !(tu->states & UHasTokens) ||
84 (tu->states & UTokensBad)) {
85 afs_PutUser(tu, READ_LOCK);
86 return (arights & avc->anyAccess);
89 afs_PutUser(tu, READ_LOCK);
93 { /* Ok, user has valid tokens, go ask the server. */
94 struct AFSFetchStatus OutStatus;
97 code = afs_FetchStatus(avc, &avc->fid, areq, &OutStatus);
98 return (code ? 0 : OutStatus.CallerAccess & arights);
103 /* the new access ok function. AVC must be held but not locked. if avc is a
104 * file, its parent need not be held, and should not be locked. */
106 int afs_AccessOK(struct vcache *avc, afs_int32 arights, struct vrequest *areq,
107 afs_int32 check_mode_bits)
109 register struct vcache *tvc;
110 struct VenusFid dirFid;
111 register afs_int32 mask;
113 register afs_int32 fileBits;
115 AFS_STATCNT(afs_AccessOK);
117 if ((vType(avc) == VDIR) || (avc->states & CForeign)) {
118 /* rights are just those from acl */
119 return (arights == afs_GetAccessBits(avc, arights, areq));
122 /* some rights come from dir and some from file. Specifically, you
123 * have "a" rights to a file if you are its owner, which comes
124 * back as "a" rights to the file. You have other rights just
125 * from dir, but all are restricted by the file mode bit. Now,
126 * if you have I and A rights to a file, we throw in R and W
127 * rights for free. These rights will then be restricted by
128 * the access mask. */
130 if (avc->parentVnode) {
131 dirFid.Cell = avc->fid.Cell;
132 dirFid.Fid.Volume = avc->fid.Fid.Volume;
133 dirFid.Fid.Vnode = avc->parentVnode;
134 dirFid.Fid.Unique = avc->parentUnique;
135 /* Avoid this GetVCache call */
136 tvc = afs_GetVCache(&dirFid, areq, NULL, NULL);
138 dirBits = afs_GetAccessBits(tvc, arights, areq);
143 dirBits = 0xffffffff; /* assume OK; this is a race condition */
144 if (arights & PRSFS_ADMINISTER)
145 fileBits = afs_GetAccessBits(avc, arights, areq);
147 fileBits = 0; /* don't make call if results don't matter */
149 /* compute basic rights in fileBits, taking A from file bits */
150 fileBits = (fileBits & PRSFS_ADMINISTER) | (dirBits & ~PRSFS_ADMINISTER);
152 /* for files, throw in R and W if have I and A (owner). This makes
153 insert-only dirs work properly */
154 if (vType(avc) != VDIR && (fileBits & (PRSFS_ADMINISTER | PRSFS_INSERT)) ==
155 (PRSFS_ADMINISTER | PRSFS_INSERT))
156 fileBits |= (PRSFS_READ | PRSFS_WRITE);
158 if (check_mode_bits & CHECK_MODE_BITS) {
159 /* owner mode bits are further restrictions on the access mode
160 * The mode bits are mapped to protection bits through the
161 * fileModeMap. If CMB_ALLOW_EXEC_AS_READ is set, it's from the
162 * NFS translator and we don't know if it's a read or execute
163 * on the NFS client, but both need to read the data.
165 mask = (avc->m.Mode & 0700) >> 6; /* file restrictions to use */
166 fileBits &= ~fileModeMap[mask];
167 if (check_mode_bits & CMB_ALLOW_EXEC_AS_READ) {
168 if (avc->m.Mode & 0100) fileBits |= PRSFS_READ;
171 return ((fileBits & arights) == arights); /* true if all rights bits are on */
176 #if defined(AFS_SUN5_ENV) || (defined(AFS_SGI_ENV) && !defined(AFS_SGI65_ENV))
177 int afs_access(OSI_VC_DECL(avc), register afs_int32 amode, int flags, struct AFS_UCRED *acred)
179 int afs_access(OSI_VC_DECL(avc), register afs_int32 amode, struct AFS_UCRED *acred)
182 register afs_int32 code;
183 struct vrequest treq;
184 struct afs_fakestat_state fakestate;
187 AFS_STATCNT(afs_access);
188 afs_Trace3(afs_iclSetp, CM_TRACE_ACCESS, ICL_TYPE_POINTER, avc,
189 ICL_TYPE_INT32, amode,
190 ICL_TYPE_OFFSET, ICL_HANDLE_OFFSET(avc->m.Length));
191 afs_InitFakeStat(&fakestate);
192 if ((code = afs_InitReq(&treq, acred))) return code;
194 code = afs_EvalFakeStat(&avc, &fakestate, &treq);
196 afs_PutFakeStat(&fakestate);
200 code = afs_VerifyVCache(avc, &treq);
202 afs_PutFakeStat(&fakestate);
203 code = afs_CheckCode(code, &treq, 16);
207 /* if we're looking for write access and we have a read-only file system, report it */
208 if ((amode & VWRITE) && (avc->states & CRO)) {
209 afs_PutFakeStat(&fakestate);
212 code = 1; /* Default from here on in is access ok. */
213 if (avc->states & CForeign) {
214 /* In the dfs xlator the EXEC bit is mapped to LOOKUP */
216 code = afs_AccessOK(avc, PRSFS_LOOKUP, &treq, CHECK_MODE_BITS);
217 if (code && (amode & VWRITE)) {
218 code = afs_AccessOK(avc, PRSFS_WRITE, &treq, CHECK_MODE_BITS);
219 if (code && (vType(avc) == VDIR)) {
221 code = afs_AccessOK(avc, PRSFS_INSERT, &treq, CHECK_MODE_BITS);
223 code = afs_AccessOK(avc, PRSFS_DELETE, &treq, CHECK_MODE_BITS);
226 if (code && (amode & VREAD))
227 code = afs_AccessOK(avc, PRSFS_READ, &treq, CHECK_MODE_BITS);
229 if (vType(avc) == VDIR) {
231 code = afs_AccessOK(avc, PRSFS_LOOKUP, &treq, CHECK_MODE_BITS);
232 if (code && (amode & VWRITE)) {
233 code = afs_AccessOK(avc, PRSFS_INSERT, &treq, CHECK_MODE_BITS);
235 code = afs_AccessOK(avc, PRSFS_DELETE, &treq, CHECK_MODE_BITS);
237 if (code && (amode & VREAD))
238 code = afs_AccessOK(avc, PRSFS_LOOKUP, &treq, CHECK_MODE_BITS);
241 code = afs_AccessOK(avc, PRSFS_READ, &treq, CHECK_MODE_BITS);
245 * The nfs server in read operations for non-owner of a file
246 * will also check the access with the VEXEC (along with VREAD)
247 * because for them exec is the same as read over the net because of
248 * demand loading. But this means if the mode bit is '-rw' the call
249 * will fail below; so for this particular case where both modes are
250 * specified (only in rfs_read so far) and from the xlator requests
253 if (!((amode & VREAD) && AFS_NFSXLATORREQ(acred)))
255 if ((avc->m.Mode & 0100) == 0) code = 0;
256 } else if (avc->m.Mode & 0100) code = 1;
258 if (code && (amode & VWRITE))
260 code = afs_AccessOK(avc, PRSFS_WRITE, &treq, CHECK_MODE_BITS);
262 /* The above call fails when the NFS translator tries to copy
263 ** a file with r--r--r-- permissions into a directory which
264 ** has system:anyuser acl. This is because the destination file
265 ** file is first created with r--r--r-- permissions through an
266 ** unauthenticated connectin. hence, the above afs_AccessOK
267 ** call returns failure. hence, we retry without any file
268 ** mode bit checking */
269 if ( !code && AFS_NFSXLATORREQ(acred) && avc->m.Owner == ANONYMOUSID)
270 code=afs_AccessOK(avc,PRSFS_WRITE, &treq, DONT_CHECK_MODE_BITS);
272 if (code && (amode & VREAD))
273 code = afs_AccessOK(avc, PRSFS_READ, &treq, CHECK_MODE_BITS);
276 afs_PutFakeStat(&fakestate);
278 return 0; /* if access is ok */
280 code = afs_CheckCode(EACCES, &treq, 17); /* failure code */
285 #if defined(UKERNEL) && defined(AFS_WEB_ENHANCEMENTS)
288 * This function is just an interface to afs_GetAccessBits
290 int afs_getRights(OSI_VC_DECL(avc), register afs_int32 arights, struct AFS_UCRED *acred)
292 register afs_int32 code;
293 struct vrequest treq;
296 if (code = afs_InitReq(&treq, acred)) return code;
298 code = afs_VerifyVCache(avc, &treq);
300 code = afs_CheckCode(code, &treq, 16);
304 return afs_GetAccessBits(avc, arights, &treq);
306 #endif /* defined(UKERNEL) && defined(AFS_WEB_ENHANCEMENTS) */