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         struct posix_acl *acl;
  34         struct inode *inode;
  35         svc_fh *fh;
  36         __be32 nfserr = 0;
  37
  38         dprintk("nfsd: GETACL(2acl)   %s\n", SVCFH_fmt(&argp->fh));
  39
  40         fh = fh_copy(&resp->fh, &argp->fh);
  41         nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
  42         if (nfserr)
  43                 RETURN_STATUS(nfserr);
  44
  45         inode = fh->fh_dentry->d_inode;
  46
  47         if (argp->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
  48                 RETURN_STATUS(nfserr_inval);
  49         resp->mask = argp->mask;
  50
  51         nfserr = fh_getattr(fh, &resp->stat);
  52         if (nfserr)
  53                 goto fail;
  54
  55         if (resp->mask & (NFS_ACL|NFS_ACLCNT)) {
  56                 acl = get_acl(inode, ACL_TYPE_ACCESS);
  57                 if (IS_ERR(acl)) {
  58                         nfserr = nfserrno(PTR_ERR(acl));
  59                         goto fail;
  60                 }
  61                 if (acl == NULL) {
  62                         /* Solaris returns the inode's minimum ACL. */
  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                 acl = get_acl(inode, ACL_TYPE_DEFAULT);
  71                 if (IS_ERR(acl)) {
  72                         nfserr = nfserrno(PTR_ERR(acl));
  73                         goto fail;
  74                 }
  75                 resp->acl_default = acl;
  76         }
  77
  78         /* resp->acl_{access,default} are released in nfssvc_release_getacl. */
  79         RETURN_STATUS(0);
  80
  81 fail:
  82         posix_acl_release(resp->acl_access);
  83         posix_acl_release(resp->acl_default);
  84         RETURN_STATUS(nfserr);
  85 }
  86
  87 /*
  88  * Set the Access and/or Default ACL of a file.
  89  */
  90 static __be32 nfsacld_proc_setacl(struct svc_rqst * rqstp,
  91                 struct nfsd3_setaclargs *argp,
  92                 struct nfsd_attrstat *resp)
  93 {
  94         struct inode *inode;
  95         svc_fh *fh;
  96         __be32 nfserr = 0;
  97         int error;
  98
  99         dprintk("nfsd: SETACL(2acl)   %s\n", SVCFH_fmt(&argp->fh));
 100
 101         fh = fh_copy(&resp->fh, &argp->fh);
 102         nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
 103         if (nfserr)
 104                 goto out;
 105
 106         inode = fh->fh_dentry->d_inode;
 107         if (!IS_POSIXACL(inode) || !inode->i_op->set_acl) {
 108                 error = -EOPNOTSUPP;
 109                 goto out_errno;
 110         }
 111
 112         error = fh_want_write(fh);
 113         if (error)
 114                 goto out_errno;
 115
 116         error = inode->i_op->set_acl(inode, argp->acl_access, ACL_TYPE_ACCESS);
 117         if (error)
 118                 goto out_drop_write;
 119         error = inode->i_op->set_acl(inode, argp->acl_default,
 120                                      ACL_TYPE_DEFAULT);
 121         if (error)
 122                 goto out_drop_write;
 123
 124         fh_drop_write(fh);
 125
 126         nfserr = fh_getattr(fh, &resp->stat);
 127
 128 out:
 129         /* argp->acl_{access,default} may have been allocated in
 130            nfssvc_decode_setaclargs. */
 131         posix_acl_release(argp->acl_access);
 132         posix_acl_release(argp->acl_default);
 133         return nfserr;
 134 out_drop_write:
 135         fh_drop_write(fh);
 136 out_errno:
 137         nfserr = nfserrno(error);
 138         goto out;
 139 }
 140
 141 /*
 142  * Check file attributes
 143  */
 144 static __be32 nfsacld_proc_getattr(struct svc_rqst * rqstp,
 145                 struct nfsd_fhandle *argp, struct nfsd_attrstat *resp)
 146 {
 147         __be32 nfserr;
 148         dprintk("nfsd: GETATTR  %s\n", SVCFH_fmt(&argp->fh));
 149
 150         fh_copy(&resp->fh, &argp->fh);
 151         nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
 152         if (nfserr)
 153                 return nfserr;
 154         nfserr = fh_getattr(&resp->fh, &resp->stat);
 155         return nfserr;
 156 }
 157
 158 /*
 159  * Check file access
 160  */
 161 static __be32 nfsacld_proc_access(struct svc_rqst *rqstp, struct nfsd3_accessargs *argp,
 162                 struct nfsd3_accessres *resp)
 163 {
 164         __be32 nfserr;
 165
 166         dprintk("nfsd: ACCESS(2acl)   %s 0x%x\n",
 167                         SVCFH_fmt(&argp->fh),
 168                         argp->access);
 169
 170         fh_copy(&resp->fh, &argp->fh);
 171         resp->access = argp->access;
 172         nfserr = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
 173         if (nfserr)
 174                 return nfserr;
 175         nfserr = fh_getattr(&resp->fh, &resp->stat);
 176         return nfserr;
 177 }
 178
 179 /*
 180  * XDR decode functions
 181  */
 182 static int nfsaclsvc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p,
 183                 struct nfsd3_getaclargs *argp)
 184 {
 185         p = nfs2svc_decode_fh(p, &argp->fh);
 186         if (!p)
 187                 return 0;
 188         argp->mask = ntohl(*p); p++;
 189
 190         return xdr_argsize_check(rqstp, p);
 191 }
 192
 193
 194 static int nfsaclsvc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p,
 195                 struct nfsd3_setaclargs *argp)
 196 {
 197         struct kvec *head = rqstp->rq_arg.head;
 198         unsigned int base;
 199         int n;
 200
 201         p = nfs2svc_decode_fh(p, &argp->fh);
 202         if (!p)
 203                 return 0;
 204         argp->mask = ntohl(*p++);
 205         if (argp->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT) ||
 206             !xdr_argsize_check(rqstp, p))
 207                 return 0;
 208
 209         base = (char *)p - (char *)head->iov_base;
 210         n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
 211                           (argp->mask & NFS_ACL) ?
 212                           &argp->acl_access : NULL);
 213         if (n > 0)
 214                 n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
 215                                   (argp->mask & NFS_DFACL) ?
 216                                   &argp->acl_default : NULL);
 217         return (n > 0);
 218 }
 219
 220 static int nfsaclsvc_decode_fhandleargs(struct svc_rqst *rqstp, __be32 *p,
 221                 struct nfsd_fhandle *argp)
 222 {
 223         p = nfs2svc_decode_fh(p, &argp->fh);
 224         if (!p)
 225                 return 0;
 226         return xdr_argsize_check(rqstp, p);
 227 }
 228
 229 static int nfsaclsvc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p,
 230                 struct nfsd3_accessargs *argp)
 231 {
 232         p = nfs2svc_decode_fh(p, &argp->fh);
 233         if (!p)
 234                 return 0;
 235         argp->access = ntohl(*p++);
 236
 237         return xdr_argsize_check(rqstp, p);
 238 }
 239
 240 /*
 241  * XDR encode functions
 242  */
 243
 244 /*
 245  * There must be an encoding function for void results so svc_process
 246  * will work properly.
 247  */
 248 static int nfsaclsvc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
 249 {
 250         return xdr_ressize_check(rqstp, p);
 251 }
 252
 253 /* GETACL */
 254 static int nfsaclsvc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p,
 255                 struct nfsd3_getaclres *resp)
 256 {
 257         struct dentry *dentry = resp->fh.fh_dentry;
 258         struct inode *inode;
 259         struct kvec *head = rqstp->rq_res.head;
 260         unsigned int base;
 261         int n;
 262         int w;
 263
 264         /*
 265          * Since this is version 2, the check for nfserr in
 266          * nfsd_dispatch actually ensures the following cannot happen.
 267          * However, it seems fragile to depend on that.
 268          */
 269         if (dentry == NULL || dentry->d_inode == NULL)
 270                 return 0;
 271         inode = dentry->d_inode;
 272
 273         p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat);
 274         *p++ = htonl(resp->mask);
 275         if (!xdr_ressize_check(rqstp, p))
 276                 return 0;
 277         base = (char *)p - (char *)head->iov_base;
 278
 279         rqstp->rq_res.page_len = w = nfsacl_size(
 280                 (resp->mask & NFS_ACL)   ? resp->acl_access  : NULL,
 281                 (resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
 282         while (w > 0) {
 283                 if (!*(rqstp->rq_next_page++))
 284                         return 0;
 285                 w -= PAGE_SIZE;
 286         }
 287
 288         n = nfsacl_encode(&rqstp->rq_res, base, inode,
 289                           resp->acl_access,
 290                           resp->mask & NFS_ACL, 0);
 291         if (n > 0)
 292                 n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
 293                                   resp->acl_default,
 294                                   resp->mask & NFS_DFACL,
 295                                   NFS_ACL_DEFAULT);
 296         if (n <= 0)
 297                 return 0;
 298         return 1;
 299 }
 300
 301 static int nfsaclsvc_encode_attrstatres(struct svc_rqst *rqstp, __be32 *p,
 302                 struct nfsd_attrstat *resp)
 303 {
 304         p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat);
 305         return xdr_ressize_check(rqstp, p);
 306 }
 307
 308 /* ACCESS */
 309 static int nfsaclsvc_encode_accessres(struct svc_rqst *rqstp, __be32 *p,
 310                 struct nfsd3_accessres *resp)
 311 {
 312         p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat);
 313         *p++ = htonl(resp->access);
 314         return xdr_ressize_check(rqstp, p);
 315 }
 316
 317 /*
 318  * XDR release functions
 319  */
 320 static int nfsaclsvc_release_getacl(struct svc_rqst *rqstp, __be32 *p,
 321                 struct nfsd3_getaclres *resp)
 322 {
 323         fh_put(&resp->fh);
 324         posix_acl_release(resp->acl_access);
 325         posix_acl_release(resp->acl_default);
 326         return 1;
 327 }
 328
 329 static int nfsaclsvc_release_attrstat(struct svc_rqst *rqstp, __be32 *p,
 330                 struct nfsd_attrstat *resp)
 331 {
 332         fh_put(&resp->fh);
 333         return 1;
 334 }
 335
 336 static int nfsaclsvc_release_access(struct svc_rqst *rqstp, __be32 *p,
 337                struct nfsd3_accessres *resp)
 338 {
 339        fh_put(&resp->fh);
 340        return 1;
 341 }
 342
 343 #define nfsaclsvc_decode_voidargs       NULL
 344 #define nfsaclsvc_release_void          NULL
 345 #define nfsd3_fhandleargs       nfsd_fhandle
 346 #define nfsd3_attrstatres       nfsd_attrstat
 347 #define nfsd3_voidres           nfsd3_voidargs
 348 struct nfsd3_voidargs { int dummy; };
 349
 350 #define PROC(name, argt, rest, relt, cache, respsize)   \
 351  { (svc_procfunc) nfsacld_proc_##name,          \
 352    (kxdrproc_t) nfsaclsvc_decode_##argt##args,  \
 353    (kxdrproc_t) nfsaclsvc_encode_##rest##res,   \
 354    (kxdrproc_t) nfsaclsvc_release_##relt,               \
 355    sizeof(struct nfsd3_##argt##args),           \
 356    sizeof(struct nfsd3_##rest##res),            \
 357    0,                                           \
 358    cache,                                       \
 359    respsize,                                    \
 360  }
 361
 362 #define ST 1            /* status*/
 363 #define AT 21           /* attributes */
 364 #define pAT (1+AT)      /* post attributes - conditional */
 365 #define ACL (1+NFS_ACL_MAX_ENTRIES*3)  /* Access Control List */
 366
 367 static struct svc_procedure             nfsd_acl_procedures2[] = {
 368   PROC(null,    void,           void,           void,     RC_NOCACHE, ST),
 369   PROC(getacl,  getacl,         getacl,         getacl,   RC_NOCACHE, ST+1+2*(1+ACL)),
 370   PROC(setacl,  setacl,         attrstat,       attrstat, RC_NOCACHE, ST+AT),
 371   PROC(getattr, fhandle,        attrstat,       attrstat, RC_NOCACHE, ST+AT),
 372   PROC(access,  access,         access,         access,   RC_NOCACHE, ST+AT+1),
 373 };
 374
 375 struct svc_version      nfsd_acl_version2 = {
 376                 .vs_vers        = 2,
 377                 .vs_nproc       = 5,
 378                 .vs_proc        = nfsd_acl_procedures2,
 379                 .vs_dispatch    = nfsd_dispatch,
 380                 .vs_xdrsize     = NFS3_SVC_XDRSIZE,
 381                 .vs_hidden      = 0,
 382 };