fs/nfsd/nfs2acl.c

   1 /*
   2  * Process version 2 NFSACL requests.
   3  *
   4  * Copyright (C) 2002-2003 Andreas Gruenbacher <agruen@suse.de>
   5  */
   6
   7 #include "nfsd.h"
   8 /* FIXME: nfsacl.h is a broken header */
   9 #include <linux/nfsacl.h>
  10 #include <linux/gfp.h>
  11 #include "cache.h"
  12 #include "xdr3.h"
  13 #include "vfs.h"
  14
  15 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  16 #define RETURN_STATUS(st)       { resp->status = (st); return (st); }
  17
  18 /*
  19  * NULL call.
  20  */
  21 static __be32
  22 nfsacld_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
  23 {
  24         return nfs_ok;
  25 }
  26
  27 /*
  28  * Get the Access and/or Default ACL of a file.
  29  */
  30 static __be32 nfsacld_proc_getacl(struct svc_rqst * rqstp,
  31                 struct nfsd3_getaclargs *argp, struct nfsd3_getaclres *resp)
  32 {
  33         svc_fh *fh;
  34         struct posix_acl *acl;
  35         __be32 nfserr = 0;
  36
  37         dprintk("nfsd: GETACL(2acl)   %s\n", SVCFH_fmt(&argp->fh));
  38
  39         fh = fh_copy(&resp->fh, &argp->fh);
  40         nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
  41         if (nfserr)
  42                 RETURN_STATUS(nfserr);
  43
  44         if (argp->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
  45                 RETURN_STATUS(nfserr_inval);
  46         resp->mask = argp->mask;
  47
  48         nfserr = fh_getattr(fh, &resp->stat);
  49         if (nfserr)
  50                 goto fail;
  51
  52         if (resp->mask & (NFS_ACL|NFS_ACLCNT)) {
  53                 acl = nfsd_get_posix_acl(fh, ACL_TYPE_ACCESS);
  54                 if (IS_ERR(acl)) {
  55                         int err = PTR_ERR(acl);
  56
  57                         if (err == -ENODATA || err == -EOPNOTSUPP)
  58                                 acl = NULL;
  59                         else {
  60                                 nfserr = nfserrno(err);
  61                                 goto fail;
  62                         }
  63                 }
  64                 if (acl == NULL) {
  65                         /* Solaris returns the inode's minimum ACL. */
  66
  67                         struct inode *inode = fh->fh_dentry->d_inode;
  68                         acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
  69                 }
  70                 resp->acl_access = acl;
  71         }
  72         if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) {
  73                 /* Check how Solaris handles requests for the Default ACL
  74                    of a non-directory! */
  75
  76                 acl = nfsd_get_posix_acl(fh, ACL_TYPE_DEFAULT);
  77                 if (IS_ERR(acl)) {
  78                         int err = PTR_ERR(acl);
  79
  80                         if (err == -ENODATA || err == -EOPNOTSUPP)
  81                                 acl = NULL;
  82                         else {
  83                                 nfserr = nfserrno(err);
  84                                 goto fail;
  85                         }
  86                 }
  87                 resp->acl_default = acl;
  88         }
  89
  90         /* resp->acl_{access,default} are released in nfssvc_release_getacl. */
  91         RETURN_STATUS(0);
  92
  93 fail:
  94         posix_acl_release(resp->acl_access);
  95         posix_acl_release(resp->acl_default);
  96         RETURN_STATUS(nfserr);
  97 }
  98
  99 /*
 100  * Set the Access and/or Default ACL of a file.
 101  */
 102 static __be32 nfsacld_proc_setacl(struct svc_rqst * rqstp,
 103                 struct nfsd3_setaclargs *argp,
 104                 struct nfsd_attrstat *resp)
 105 {
 106         svc_fh *fh;
 107         __be32 nfserr = 0;
 108
 109         dprintk("nfsd: SETACL(2acl)   %s\n", SVCFH_fmt(&argp->fh));
 110
 111         fh = fh_copy(&resp->fh, &argp->fh);
 112         nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
 113
 114         if (!nfserr) {
 115                 nfserr = nfserrno( nfsd_set_posix_acl(
 116                         fh, ACL_TYPE_ACCESS, argp->acl_access) );
 117         }
 118         if (!nfserr) {
 119                 nfserr = nfserrno( nfsd_set_posix_acl(
 120                         fh, ACL_TYPE_DEFAULT, argp->acl_default) );
 121         }
 122         if (!nfserr) {
 123                 nfserr = fh_getattr(fh, &resp->stat);
 124         }
 125
 126         /* argp->acl_{access,default} may have been allocated in
 127            nfssvc_decode_setaclargs. */
 128         posix_acl_release(argp->acl_access);
 129         posix_acl_release(argp->acl_default);
 130         return nfserr;
 131 }
 132
 133 /*
 134  * Check file attributes
 135  */
 136 static __be32 nfsacld_proc_getattr(struct svc_rqst * rqstp,
 137                 struct nfsd_fhandle *argp, struct nfsd_attrstat *resp)
 138 {
 139         __be32 nfserr;
 140         dprintk("nfsd: GETATTR  %s\n", SVCFH_fmt(&argp->fh));
 141
 142         fh_copy(&resp->fh, &argp->fh);
 143         nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
 144         if (nfserr)
 145                 return nfserr;
 146         nfserr = fh_getattr(&resp->fh, &resp->stat);
 147         return nfserr;
 148 }
 149
 150 /*
 151  * Check file access
 152  */
 153 static __be32 nfsacld_proc_access(struct svc_rqst *rqstp, struct nfsd3_accessargs *argp,
 154                 struct nfsd3_accessres *resp)
 155 {
 156         __be32 nfserr;
 157
 158         dprintk("nfsd: ACCESS(2acl)   %s 0x%x\n",
 159                         SVCFH_fmt(&argp->fh),
 160                         argp->access);
 161
 162         fh_copy(&resp->fh, &argp->fh);
 163         resp->access = argp->access;
 164         nfserr = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
 165         if (nfserr)
 166                 return nfserr;
 167         nfserr = fh_getattr(&resp->fh, &resp->stat);
 168         return nfserr;
 169 }
 170
 171 /*
 172  * XDR decode functions
 173  */
 174 static int nfsaclsvc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p,
 175                 struct nfsd3_getaclargs *argp)
 176 {
 177         if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
 178                 return 0;
 179         argp->mask = ntohl(*p); p++;
 180
 181         return xdr_argsize_check(rqstp, p);
 182 }
 183
 184
 185 static int nfsaclsvc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p,
 186                 struct nfsd3_setaclargs *argp)
 187 {
 188         struct kvec *head = rqstp->rq_arg.head;
 189         unsigned int base;
 190         int n;
 191
 192         if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
 193                 return 0;
 194         argp->mask = ntohl(*p++);
 195         if (argp->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT) ||
 196             !xdr_argsize_check(rqstp, p))
 197                 return 0;
 198
 199         base = (char *)p - (char *)head->iov_base;
 200         n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
 201                           (argp->mask & NFS_ACL) ?
 202                           &argp->acl_access : NULL);
 203         if (n > 0)
 204                 n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
 205                                   (argp->mask & NFS_DFACL) ?
 206                                   &argp->acl_default : NULL);
 207         return (n > 0);
 208 }
 209
 210 static int nfsaclsvc_decode_fhandleargs(struct svc_rqst *rqstp, __be32 *p,
 211                 struct nfsd_fhandle *argp)
 212 {
 213         if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
 214                 return 0;
 215         return xdr_argsize_check(rqstp, p);
 216 }
 217
 218 static int nfsaclsvc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p,
 219                 struct nfsd3_accessargs *argp)
 220 {
 221         if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
 222                 return 0;
 223         argp->access = ntohl(*p++);
 224
 225         return xdr_argsize_check(rqstp, p);
 226 }
 227
 228 /*
 229  * XDR encode functions
 230  */
 231
 232 /*
 233  * There must be an encoding function for void results so svc_process
 234  * will work properly.
 235  */
 236 static int nfsaclsvc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
 237 {
 238         return xdr_ressize_check(rqstp, p);
 239 }
 240
 241 /* GETACL */
 242 static int nfsaclsvc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p,
 243                 struct nfsd3_getaclres *resp)
 244 {
 245         struct dentry *dentry = resp->fh.fh_dentry;
 246         struct inode *inode;
 247         struct kvec *head = rqstp->rq_res.head;
 248         unsigned int base;
 249         int n;
 250         int w;
 251
 252         /*
 253          * Since this is version 2, the check for nfserr in
 254          * nfsd_dispatch actually ensures the following cannot happen.
 255          * However, it seems fragile to depend on that.
 256          */
 257         if (dentry == NULL || dentry->d_inode == NULL)
 258                 return 0;
 259         inode = dentry->d_inode;
 260
 261         p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat);
 262         *p++ = htonl(resp->mask);
 263         if (!xdr_ressize_check(rqstp, p))
 264                 return 0;
 265         base = (char *)p - (char *)head->iov_base;
 266
 267         rqstp->rq_res.page_len = w = nfsacl_size(
 268                 (resp->mask & NFS_ACL)   ? resp->acl_access  : NULL,
 269                 (resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
 270         while (w > 0) {
 271                 if (!*(rqstp->rq_next_page++))
 272                         return 0;
 273                 w -= PAGE_SIZE;
 274         }
 275
 276         n = nfsacl_encode(&rqstp->rq_res, base, inode,
 277                           resp->acl_access,
 278                           resp->mask & NFS_ACL, 0);
 279         if (n > 0)
 280                 n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
 281                                   resp->acl_default,
 282                                   resp->mask & NFS_DFACL,
 283                                   NFS_ACL_DEFAULT);
 284         if (n <= 0)
 285                 return 0;
 286         return 1;
 287 }
 288
 289 static int nfsaclsvc_encode_attrstatres(struct svc_rqst *rqstp, __be32 *p,
 290                 struct nfsd_attrstat *resp)
 291 {
 292         p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat);
 293         return xdr_ressize_check(rqstp, p);
 294 }
 295
 296 /* ACCESS */
 297 static int nfsaclsvc_encode_accessres(struct svc_rqst *rqstp, __be32 *p,
 298                 struct nfsd3_accessres *resp)
 299 {
 300         p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat);
 301         *p++ = htonl(resp->access);
 302         return xdr_ressize_check(rqstp, p);
 303 }
 304
 305 /*
 306  * XDR release functions
 307  */
 308 static int nfsaclsvc_release_getacl(struct svc_rqst *rqstp, __be32 *p,
 309                 struct nfsd3_getaclres *resp)
 310 {
 311         fh_put(&resp->fh);
 312         posix_acl_release(resp->acl_access);
 313         posix_acl_release(resp->acl_default);
 314         return 1;
 315 }
 316
 317 static int nfsaclsvc_release_attrstat(struct svc_rqst *rqstp, __be32 *p,
 318                 struct nfsd_attrstat *resp)
 319 {
 320         fh_put(&resp->fh);
 321         return 1;
 322 }
 323
 324 static int nfsaclsvc_release_access(struct svc_rqst *rqstp, __be32 *p,
 325                struct nfsd3_accessres *resp)
 326 {
 327        fh_put(&resp->fh);
 328        return 1;
 329 }
 330
 331 #define nfsaclsvc_decode_voidargs       NULL
 332 #define nfsaclsvc_release_void          NULL
 333 #define nfsd3_fhandleargs       nfsd_fhandle
 334 #define nfsd3_attrstatres       nfsd_attrstat
 335 #define nfsd3_voidres           nfsd3_voidargs
 336 struct nfsd3_voidargs { int dummy; };
 337
 338 #define PROC(name, argt, rest, relt, cache, respsize)   \
 339  { (svc_procfunc) nfsacld_proc_##name,          \
 340    (kxdrproc_t) nfsaclsvc_decode_##argt##args,  \
 341    (kxdrproc_t) nfsaclsvc_encode_##rest##res,   \
 342    (kxdrproc_t) nfsaclsvc_release_##relt,               \
 343    sizeof(struct nfsd3_##argt##args),           \
 344    sizeof(struct nfsd3_##rest##res),            \
 345    0,                                           \
 346    cache,                                       \
 347    respsize,                                    \
 348  }
 349
 350 #define ST 1            /* status*/
 351 #define AT 21           /* attributes */
 352 #define pAT (1+AT)      /* post attributes - conditional */
 353 #define ACL (1+NFS_ACL_MAX_ENTRIES*3)  /* Access Control List */
 354
 355 static struct svc_procedure             nfsd_acl_procedures2[] = {
 356   PROC(null,    void,           void,           void,     RC_NOCACHE, ST),
 357   PROC(getacl,  getacl,         getacl,         getacl,   RC_NOCACHE, ST+1+2*(1+ACL)),
 358   PROC(setacl,  setacl,         attrstat,       attrstat, RC_NOCACHE, ST+AT),
 359   PROC(getattr, fhandle,        attrstat,       attrstat, RC_NOCACHE, ST+AT),
 360   PROC(access,  access,         access,         access,   RC_NOCACHE, ST+AT+1),
 361 };
 362
 363 struct svc_version      nfsd_acl_version2 = {
 364                 .vs_vers        = 2,
 365                 .vs_nproc       = 5,
 366                 .vs_proc        = nfsd_acl_procedures2,
 367                 .vs_dispatch    = nfsd_dispatch,
 368                 .vs_xdrsize     = NFS3_SVC_XDRSIZE,
 369                 .vs_hidden      = 0,
 370 };