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