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