fs/nfsd/nfs2acl.c

   1 /*
   2  * linux/fs/nfsd/nfs2acl.c
   3  *
   4  * Process version 2 NFSACL requests.
   5  *
   6  * Copyright (C) 2002-2003 Andreas Gruenbacher <agruen@suse.de>
   7  */
   8
   9 #include <linux/sunrpc/svc.h>
  10 #include <linux/nfs.h>
  11 #include <linux/nfsd/nfsd.h>
  12 #include <linux/nfsd/cache.h>
  13 #include <linux/nfsd/xdr.h>
  14 #include <linux/nfsd/xdr3.h>
  15 #include <linux/posix_acl.h>
  16 #include <linux/nfsacl.h>
  17
  18 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  19 #define RETURN_STATUS(st)       { resp->status = (st); return (st); }
  20
  21 /*
  22  * NULL call.
  23  */
  24 static __be32
  25 nfsacld_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
  26 {
  27         return nfs_ok;
  28 }
  29
  30 /*
  31  * Get the Access and/or Default ACL of a file.
  32  */
  33 static __be32 nfsacld_proc_getacl(struct svc_rqst * rqstp,
  34                 struct nfsd3_getaclargs *argp, struct nfsd3_getaclres *resp)
  35 {
  36         svc_fh *fh;
  37         struct posix_acl *acl;
  38         __be32 nfserr = 0;
  39
  40         dprintk("nfsd: GETACL(2acl)   %s\n", SVCFH_fmt(&argp->fh));
  41
  42         fh = fh_copy(&resp->fh, &argp->fh);
  43         nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
  44         if (nfserr)
  45                 RETURN_STATUS(nfserr);
  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         if (resp->mask & (NFS_ACL|NFS_ACLCNT)) {
  52                 acl = nfsd_get_posix_acl(fh, ACL_TYPE_ACCESS);
  53                 if (IS_ERR(acl)) {
  54                         int err = PTR_ERR(acl);
  55
  56                         if (err == -ENODATA || err == -EOPNOTSUPP)
  57                                 acl = NULL;
  58                         else {
  59                                 nfserr = nfserrno(err);
  60                                 goto fail;
  61                         }
  62                 }
  63                 if (acl == NULL) {
  64                         /* Solaris returns the inode's minimum ACL. */
  65
  66                         struct inode *inode = fh->fh_dentry->d_inode;
  67                         acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
  68                 }
  69                 resp->acl_access = acl;
  70         }
  71         if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) {
  72                 /* Check how Solaris handles requests for the Default ACL
  73                    of a non-directory! */
  74
  75                 acl = nfsd_get_posix_acl(fh, ACL_TYPE_DEFAULT);
  76                 if (IS_ERR(acl)) {
  77                         int err = PTR_ERR(acl);
  78
  79                         if (err == -ENODATA || err == -EOPNOTSUPP)
  80                                 acl = NULL;
  81                         else {
  82                                 nfserr = nfserrno(err);
  83                                 goto fail;
  84                         }
  85                 }
  86                 resp->acl_default = acl;
  87         }
  88
  89         /* resp->acl_{access,default} are released in nfssvc_release_getacl. */
  90         RETURN_STATUS(0);
  91
  92 fail:
  93         posix_acl_release(resp->acl_access);
  94         posix_acl_release(resp->acl_default);
  95         RETURN_STATUS(nfserr);
  96 }
  97
  98 /*
  99  * Set the Access and/or Default ACL of a file.
 100  */
 101 static __be32 nfsacld_proc_setacl(struct svc_rqst * rqstp,
 102                 struct nfsd3_setaclargs *argp,
 103                 struct nfsd_attrstat *resp)
 104 {
 105         svc_fh *fh;
 106         __be32 nfserr = 0;
 107
 108         dprintk("nfsd: SETACL(2acl)   %s\n", SVCFH_fmt(&argp->fh));
 109
 110         fh = fh_copy(&resp->fh, &argp->fh);
 111         nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
 112
 113         if (!nfserr) {
 114                 nfserr = nfserrno( nfsd_set_posix_acl(
 115                         fh, ACL_TYPE_ACCESS, argp->acl_access) );
 116         }
 117         if (!nfserr) {
 118                 nfserr = nfserrno( nfsd_set_posix_acl(
 119                         fh, ACL_TYPE_DEFAULT, argp->acl_default) );
 120         }
 121
 122         /* argp->acl_{access,default} may have been allocated in
 123            nfssvc_decode_setaclargs. */
 124         posix_acl_release(argp->acl_access);
 125         posix_acl_release(argp->acl_default);
 126         return nfserr;
 127 }
 128
 129 /*
 130  * Check file attributes
 131  */
 132 static __be32 nfsacld_proc_getattr(struct svc_rqst * rqstp,
 133                 struct nfsd_fhandle *argp, struct nfsd_attrstat *resp)
 134 {
 135         dprintk("nfsd: GETATTR  %s\n", SVCFH_fmt(&argp->fh));
 136
 137         fh_copy(&resp->fh, &argp->fh);
 138         return fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
 139 }
 140
 141 /*
 142  * Check file access
 143  */
 144 static __be32 nfsacld_proc_access(struct svc_rqst *rqstp, struct nfsd3_accessargs *argp,
 145                 struct nfsd3_accessres *resp)
 146 {
 147         __be32 nfserr;
 148
 149         dprintk("nfsd: ACCESS(2acl)   %s 0x%x\n",
 150                         SVCFH_fmt(&argp->fh),
 151                         argp->access);
 152
 153         fh_copy(&resp->fh, &argp->fh);
 154         resp->access = argp->access;
 155         nfserr = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
 156         return nfserr;
 157 }
 158
 159 /*
 160  * XDR decode functions
 161  */
 162 static int nfsaclsvc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p,
 163                 struct nfsd3_getaclargs *argp)
 164 {
 165         if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
 166                 return 0;
 167         argp->mask = ntohl(*p); p++;
 168
 169         return xdr_argsize_check(rqstp, p);
 170 }
 171
 172
 173 static int nfsaclsvc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p,
 174                 struct nfsd3_setaclargs *argp)
 175 {
 176         struct kvec *head = rqstp->rq_arg.head;
 177         unsigned int base;
 178         int n;
 179
 180         if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
 181                 return 0;
 182         argp->mask = ntohl(*p++);
 183         if (argp->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT) ||
 184             !xdr_argsize_check(rqstp, p))
 185                 return 0;
 186
 187         base = (char *)p - (char *)head->iov_base;
 188         n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
 189                           (argp->mask & NFS_ACL) ?
 190                           &argp->acl_access : NULL);
 191         if (n > 0)
 192                 n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
 193                                   (argp->mask & NFS_DFACL) ?
 194                                   &argp->acl_default : NULL);
 195         return (n > 0);
 196 }
 197
 198 static int nfsaclsvc_decode_fhandleargs(struct svc_rqst *rqstp, __be32 *p,
 199                 struct nfsd_fhandle *argp)
 200 {
 201         if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
 202                 return 0;
 203         return xdr_argsize_check(rqstp, p);
 204 }
 205
 206 static int nfsaclsvc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p,
 207                 struct nfsd3_accessargs *argp)
 208 {
 209         if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
 210                 return 0;
 211         argp->access = ntohl(*p++);
 212
 213         return xdr_argsize_check(rqstp, p);
 214 }
 215
 216 /*
 217  * XDR encode functions
 218  */
 219
 220 /* GETACL */
 221 static int nfsaclsvc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p,
 222                 struct nfsd3_getaclres *resp)
 223 {
 224         struct dentry *dentry = resp->fh.fh_dentry;
 225         struct inode *inode;
 226         struct kvec *head = rqstp->rq_res.head;
 227         unsigned int base;
 228         int n;
 229         int w;
 230
 231         /*
 232          * Since this is version 2, the check for nfserr in
 233          * nfsd_dispatch actually ensures the following cannot happen.
 234          * However, it seems fragile to depend on that.
 235          */
 236         if (dentry == NULL || dentry->d_inode == NULL)
 237                 return 0;
 238         inode = dentry->d_inode;
 239
 240         p = nfs2svc_encode_fattr(rqstp, p, &resp->fh);
 241         *p++ = htonl(resp->mask);
 242         if (!xdr_ressize_check(rqstp, p))
 243                 return 0;
 244         base = (char *)p - (char *)head->iov_base;
 245
 246         rqstp->rq_res.page_len = w = nfsacl_size(
 247                 (resp->mask & NFS_ACL)   ? resp->acl_access  : NULL,
 248                 (resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
 249         while (w > 0) {
 250                 if (!rqstp->rq_respages[rqstp->rq_resused++])
 251                         return 0;
 252                 w -= PAGE_SIZE;
 253         }
 254
 255         n = nfsacl_encode(&rqstp->rq_res, base, inode,
 256                           resp->acl_access,
 257                           resp->mask & NFS_ACL, 0);
 258         if (n > 0)
 259                 n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
 260                                   resp->acl_default,
 261                                   resp->mask & NFS_DFACL,
 262                                   NFS_ACL_DEFAULT);
 263         if (n <= 0)
 264                 return 0;
 265         return 1;
 266 }
 267
 268 static int nfsaclsvc_encode_attrstatres(struct svc_rqst *rqstp, __be32 *p,
 269                 struct nfsd_attrstat *resp)
 270 {
 271         p = nfs2svc_encode_fattr(rqstp, p, &resp->fh);
 272         return xdr_ressize_check(rqstp, p);
 273 }
 274
 275 /* ACCESS */
 276 static int nfsaclsvc_encode_accessres(struct svc_rqst *rqstp, __be32 *p,
 277                 struct nfsd3_accessres *resp)
 278 {
 279         p = nfs2svc_encode_fattr(rqstp, p, &resp->fh);
 280         *p++ = htonl(resp->access);
 281         return xdr_ressize_check(rqstp, p);
 282 }
 283
 284 /*
 285  * XDR release functions
 286  */
 287 static int nfsaclsvc_release_getacl(struct svc_rqst *rqstp, __be32 *p,
 288                 struct nfsd3_getaclres *resp)
 289 {
 290         fh_put(&resp->fh);
 291         posix_acl_release(resp->acl_access);
 292         posix_acl_release(resp->acl_default);
 293         return 1;
 294 }
 295
 296 static int nfsaclsvc_release_attrstat(struct svc_rqst *rqstp, __be32 *p,
 297                 struct nfsd_attrstat *resp)
 298 {
 299         fh_put(&resp->fh);
 300         return 1;
 301 }
 302
 303 static int nfsaclsvc_release_access(struct svc_rqst *rqstp, __be32 *p,
 304                struct nfsd3_accessres *resp)
 305 {
 306        fh_put(&resp->fh);
 307        return 1;
 308 }
 309
 310 #define nfsaclsvc_decode_voidargs       NULL
 311 #define nfsaclsvc_encode_voidres        NULL
 312 #define nfsaclsvc_release_void          NULL
 313 #define nfsd3_fhandleargs       nfsd_fhandle
 314 #define nfsd3_attrstatres       nfsd_attrstat
 315 #define nfsd3_voidres           nfsd3_voidargs
 316 struct nfsd3_voidargs { int dummy; };
 317
 318 #define PROC(name, argt, rest, relt, cache, respsize)   \
 319  { (svc_procfunc) nfsacld_proc_##name,          \
 320    (kxdrproc_t) nfsaclsvc_decode_##argt##args,  \
 321    (kxdrproc_t) nfsaclsvc_encode_##rest##res,   \
 322    (kxdrproc_t) nfsaclsvc_release_##relt,               \
 323    sizeof(struct nfsd3_##argt##args),           \
 324    sizeof(struct nfsd3_##rest##res),            \
 325    0,                                           \
 326    cache,                                       \
 327    respsize,                                    \
 328  }
 329
 330 #define ST 1            /* status*/
 331 #define AT 21           /* attributes */
 332 #define pAT (1+AT)      /* post attributes - conditional */
 333 #define ACL (1+NFS_ACL_MAX_ENTRIES*3)  /* Access Control List */
 334
 335 static struct svc_procedure             nfsd_acl_procedures2[] = {
 336   PROC(null,    void,           void,           void,     RC_NOCACHE, ST),
 337   PROC(getacl,  getacl,         getacl,         getacl,   RC_NOCACHE, ST+1+2*(1+ACL)),
 338   PROC(setacl,  setacl,         attrstat,       attrstat, RC_NOCACHE, ST+AT),
 339   PROC(getattr, fhandle,        attrstat,       attrstat, RC_NOCACHE, ST+AT),
 340   PROC(access,  access,         access,         access,   RC_NOCACHE, ST+AT+1),
 341 };
 342
 343 struct svc_version      nfsd_acl_version2 = {
 344                 .vs_vers        = 2,
 345                 .vs_nproc       = 5,
 346                 .vs_proc        = nfsd_acl_procedures2,
 347                 .vs_dispatch    = nfsd_dispatch,
 348                 .vs_xdrsize     = NFS3_SVC_XDRSIZE,
 349                 .vs_hidden      = 1,
 350 };