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 #include "vfs.h"
  18
  19 #define NFSDDBG_FACILITY                NFSDDBG_PROC
  20 #define RETURN_STATUS(st)       { resp->status = (st); return (st); }
  21
  22 /*
  23  * NULL call.
  24  */
  25 static __be32
  26 nfsacld_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
  27 {
  28         return nfs_ok;
  29 }
  30
  31 /*
  32  * Get the Access and/or Default ACL of a file.
  33  */
  34 static __be32 nfsacld_proc_getacl(struct svc_rqst * rqstp,
  35                 struct nfsd3_getaclargs *argp, struct nfsd3_getaclres *resp)
  36 {
  37         svc_fh *fh;
  38         struct posix_acl *acl;
  39         __be32 nfserr = 0;
  40
  41         dprintk("nfsd: GETACL(2acl)   %s\n", SVCFH_fmt(&argp->fh));
  42
  43         fh = fh_copy(&resp->fh, &argp->fh);
  44         nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
  45         if (nfserr)
  46                 RETURN_STATUS(nfserr);
  47
  48         if (argp->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
  49                 RETURN_STATUS(nfserr_inval);
  50         resp->mask = argp->mask;
  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
 123         /* argp->acl_{access,default} may have been allocated in
 124            nfssvc_decode_setaclargs. */
 125         posix_acl_release(argp->acl_access);
 126         posix_acl_release(argp->acl_default);
 127         return nfserr;
 128 }
 129
 130 /*
 131  * Check file attributes
 132  */
 133 static __be32 nfsacld_proc_getattr(struct svc_rqst * rqstp,
 134                 struct nfsd_fhandle *argp, struct nfsd_attrstat *resp)
 135 {
 136         dprintk("nfsd: GETATTR  %s\n", SVCFH_fmt(&argp->fh));
 137
 138         fh_copy(&resp->fh, &argp->fh);
 139         return fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
 140 }
 141
 142 /*
 143  * Check file access
 144  */
 145 static __be32 nfsacld_proc_access(struct svc_rqst *rqstp, struct nfsd3_accessargs *argp,
 146                 struct nfsd3_accessres *resp)
 147 {
 148         __be32 nfserr;
 149
 150         dprintk("nfsd: ACCESS(2acl)   %s 0x%x\n",
 151                         SVCFH_fmt(&argp->fh),
 152                         argp->access);
 153
 154         fh_copy(&resp->fh, &argp->fh);
 155         resp->access = argp->access;
 156         nfserr = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
 157         return nfserr;
 158 }
 159
 160 /*
 161  * XDR decode functions
 162  */
 163 static int nfsaclsvc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p,
 164                 struct nfsd3_getaclargs *argp)
 165 {
 166         if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
 167                 return 0;
 168         argp->mask = ntohl(*p); p++;
 169
 170         return xdr_argsize_check(rqstp, p);
 171 }
 172
 173
 174 static int nfsaclsvc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p,
 175                 struct nfsd3_setaclargs *argp)
 176 {
 177         struct kvec *head = rqstp->rq_arg.head;
 178         unsigned int base;
 179         int n;
 180
 181         if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
 182                 return 0;
 183         argp->mask = ntohl(*p++);
 184         if (argp->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT) ||
 185             !xdr_argsize_check(rqstp, p))
 186                 return 0;
 187
 188         base = (char *)p - (char *)head->iov_base;
 189         n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
 190                           (argp->mask & NFS_ACL) ?
 191                           &argp->acl_access : NULL);
 192         if (n > 0)
 193                 n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
 194                                   (argp->mask & NFS_DFACL) ?
 195                                   &argp->acl_default : NULL);
 196         return (n > 0);
 197 }
 198
 199 static int nfsaclsvc_decode_fhandleargs(struct svc_rqst *rqstp, __be32 *p,
 200                 struct nfsd_fhandle *argp)
 201 {
 202         if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
 203                 return 0;
 204         return xdr_argsize_check(rqstp, p);
 205 }
 206
 207 static int nfsaclsvc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p,
 208                 struct nfsd3_accessargs *argp)
 209 {
 210         if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
 211                 return 0;
 212         argp->access = ntohl(*p++);
 213
 214         return xdr_argsize_check(rqstp, p);
 215 }
 216
 217 /*
 218  * XDR encode functions
 219  */
 220
 221 /*
 222  * There must be an encoding function for void results so svc_process
 223  * will work properly.
 224  */
 225 int
 226 nfsaclsvc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
 227 {
 228         return xdr_ressize_check(rqstp, p);
 229 }
 230
 231 /* GETACL */
 232 static int nfsaclsvc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p,
 233                 struct nfsd3_getaclres *resp)
 234 {
 235         struct dentry *dentry = resp->fh.fh_dentry;
 236         struct inode *inode;
 237         struct kvec *head = rqstp->rq_res.head;
 238         unsigned int base;
 239         int n;
 240         int w;
 241
 242         /*
 243          * Since this is version 2, the check for nfserr in
 244          * nfsd_dispatch actually ensures the following cannot happen.
 245          * However, it seems fragile to depend on that.
 246          */
 247         if (dentry == NULL || dentry->d_inode == NULL)
 248                 return 0;
 249         inode = dentry->d_inode;
 250
 251         p = nfs2svc_encode_fattr(rqstp, p, &resp->fh);
 252         *p++ = htonl(resp->mask);
 253         if (!xdr_ressize_check(rqstp, p))
 254                 return 0;
 255         base = (char *)p - (char *)head->iov_base;
 256
 257         rqstp->rq_res.page_len = w = nfsacl_size(
 258                 (resp->mask & NFS_ACL)   ? resp->acl_access  : NULL,
 259                 (resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
 260         while (w > 0) {
 261                 if (!rqstp->rq_respages[rqstp->rq_resused++])
 262                         return 0;
 263                 w -= PAGE_SIZE;
 264         }
 265
 266         n = nfsacl_encode(&rqstp->rq_res, base, inode,
 267                           resp->acl_access,
 268                           resp->mask & NFS_ACL, 0);
 269         if (n > 0)
 270                 n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
 271                                   resp->acl_default,
 272                                   resp->mask & NFS_DFACL,
 273                                   NFS_ACL_DEFAULT);
 274         if (n <= 0)
 275                 return 0;
 276         return 1;
 277 }
 278
 279 static int nfsaclsvc_encode_attrstatres(struct svc_rqst *rqstp, __be32 *p,
 280                 struct nfsd_attrstat *resp)
 281 {
 282         p = nfs2svc_encode_fattr(rqstp, p, &resp->fh);
 283         return xdr_ressize_check(rqstp, p);
 284 }
 285
 286 /* ACCESS */
 287 static int nfsaclsvc_encode_accessres(struct svc_rqst *rqstp, __be32 *p,
 288                 struct nfsd3_accessres *resp)
 289 {
 290         p = nfs2svc_encode_fattr(rqstp, p, &resp->fh);
 291         *p++ = htonl(resp->access);
 292         return xdr_ressize_check(rqstp, p);
 293 }
 294
 295 /*
 296  * XDR release functions
 297  */
 298 static int nfsaclsvc_release_getacl(struct svc_rqst *rqstp, __be32 *p,
 299                 struct nfsd3_getaclres *resp)
 300 {
 301         fh_put(&resp->fh);
 302         posix_acl_release(resp->acl_access);
 303         posix_acl_release(resp->acl_default);
 304         return 1;
 305 }
 306
 307 static int nfsaclsvc_release_attrstat(struct svc_rqst *rqstp, __be32 *p,
 308                 struct nfsd_attrstat *resp)
 309 {
 310         fh_put(&resp->fh);
 311         return 1;
 312 }
 313
 314 static int nfsaclsvc_release_access(struct svc_rqst *rqstp, __be32 *p,
 315                struct nfsd3_accessres *resp)
 316 {
 317        fh_put(&resp->fh);
 318        return 1;
 319 }
 320
 321 #define nfsaclsvc_decode_voidargs       NULL
 322 #define nfsaclsvc_release_void          NULL
 323 #define nfsd3_fhandleargs       nfsd_fhandle
 324 #define nfsd3_attrstatres       nfsd_attrstat
 325 #define nfsd3_voidres           nfsd3_voidargs
 326 struct nfsd3_voidargs { int dummy; };
 327
 328 #define PROC(name, argt, rest, relt, cache, respsize)   \
 329  { (svc_procfunc) nfsacld_proc_##name,          \
 330    (kxdrproc_t) nfsaclsvc_decode_##argt##args,  \
 331    (kxdrproc_t) nfsaclsvc_encode_##rest##res,   \
 332    (kxdrproc_t) nfsaclsvc_release_##relt,               \
 333    sizeof(struct nfsd3_##argt##args),           \
 334    sizeof(struct nfsd3_##rest##res),            \
 335    0,                                           \
 336    cache,                                       \
 337    respsize,                                    \
 338  }
 339
 340 #define ST 1            /* status*/
 341 #define AT 21           /* attributes */
 342 #define pAT (1+AT)      /* post attributes - conditional */
 343 #define ACL (1+NFS_ACL_MAX_ENTRIES*3)  /* Access Control List */
 344
 345 static struct svc_procedure             nfsd_acl_procedures2[] = {
 346   PROC(null,    void,           void,           void,     RC_NOCACHE, ST),
 347   PROC(getacl,  getacl,         getacl,         getacl,   RC_NOCACHE, ST+1+2*(1+ACL)),
 348   PROC(setacl,  setacl,         attrstat,       attrstat, RC_NOCACHE, ST+AT),
 349   PROC(getattr, fhandle,        attrstat,       attrstat, RC_NOCACHE, ST+AT),
 350   PROC(access,  access,         access,         access,   RC_NOCACHE, ST+AT+1),
 351 };
 352
 353 struct svc_version      nfsd_acl_version2 = {
 354                 .vs_vers        = 2,
 355                 .vs_nproc       = 5,
 356                 .vs_proc        = nfsd_acl_procedures2,
 357                 .vs_dispatch    = nfsd_dispatch,
 358                 .vs_xdrsize     = NFS3_SVC_XDRSIZE,
 359                 .vs_hidden      = 0,
 360 };