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 int
  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 int 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         int 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_inval);
  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 int nfsacld_proc_setacl(struct svc_rqst * rqstp,
 101                 struct nfsd3_setaclargs *argp,
 102                 struct nfsd_attrstat *resp)
 103 {
 104         svc_fh *fh;
 105         int 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 int 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 int nfsacld_proc_access(struct svc_rqst *rqstp, struct nfsd3_accessargs *argp,
 144                 struct nfsd3_accessres *resp)
 145 {
 146         int 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, u32 *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, u32 *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, u32 *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, u32 *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, u32 *p,
 221                 struct nfsd3_getaclres *resp)
 222 {
 223         struct dentry *dentry = resp->fh.fh_dentry;
 224         struct inode *inode = dentry->d_inode;
 225         int w = nfsacl_size(
 226                 (resp->mask & NFS_ACL)   ? resp->acl_access  : NULL,
 227                 (resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
 228         struct kvec *head = rqstp->rq_res.head;
 229         unsigned int base;
 230         int n;
 231
 232         if (dentry == NULL || dentry->d_inode == NULL)
 233                 return 0;
 234         inode = dentry->d_inode;
 235
 236         p = nfs2svc_encode_fattr(rqstp, p, &resp->fh);
 237         *p++ = htonl(resp->mask);
 238         if (!xdr_ressize_check(rqstp, p))
 239                 return 0;
 240         base = (char *)p - (char *)head->iov_base;
 241
 242         rqstp->rq_res.page_len = w;
 243         while (w > 0) {
 244                 if (!rqstp->rq_respages[rqstp->rq_resused++])
 245                         return 0;
 246                 w -= PAGE_SIZE;
 247         }
 248
 249         n = nfsacl_encode(&rqstp->rq_res, base, inode,
 250                           resp->acl_access,
 251                           resp->mask & NFS_ACL, 0);
 252         if (n > 0)
 253                 n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
 254                                   resp->acl_default,
 255                                   resp->mask & NFS_DFACL,
 256                                   NFS_ACL_DEFAULT);
 257         if (n <= 0)
 258                 return 0;
 259         return 1;
 260 }
 261
 262 static int nfsaclsvc_encode_attrstatres(struct svc_rqst *rqstp, u32 *p,
 263                 struct nfsd_attrstat *resp)
 264 {
 265         p = nfs2svc_encode_fattr(rqstp, p, &resp->fh);
 266         return xdr_ressize_check(rqstp, p);
 267 }
 268
 269 /* ACCESS */
 270 static int nfsaclsvc_encode_accessres(struct svc_rqst *rqstp, u32 *p,
 271                 struct nfsd3_accessres *resp)
 272 {
 273         p = nfs2svc_encode_fattr(rqstp, p, &resp->fh);
 274         *p++ = htonl(resp->access);
 275         return xdr_ressize_check(rqstp, p);
 276 }
 277
 278 /*
 279  * XDR release functions
 280  */
 281 static int nfsaclsvc_release_getacl(struct svc_rqst *rqstp, u32 *p,
 282                 struct nfsd3_getaclres *resp)
 283 {
 284         fh_put(&resp->fh);
 285         posix_acl_release(resp->acl_access);
 286         posix_acl_release(resp->acl_default);
 287         return 1;
 288 }
 289
 290 static int nfsaclsvc_release_fhandle(struct svc_rqst *rqstp, u32 *p,
 291                 struct nfsd_fhandle *resp)
 292 {
 293         fh_put(&resp->fh);
 294         return 1;
 295 }
 296
 297 #define nfsaclsvc_decode_voidargs       NULL
 298 #define nfsaclsvc_encode_voidres        NULL
 299 #define nfsaclsvc_release_void          NULL
 300 #define nfsd3_fhandleargs       nfsd_fhandle
 301 #define nfsd3_attrstatres       nfsd_attrstat
 302 #define nfsd3_voidres           nfsd3_voidargs
 303 struct nfsd3_voidargs { int dummy; };
 304
 305 #define PROC(name, argt, rest, relt, cache, respsize)   \
 306  { (svc_procfunc) nfsacld_proc_##name,          \
 307    (kxdrproc_t) nfsaclsvc_decode_##argt##args,  \
 308    (kxdrproc_t) nfsaclsvc_encode_##rest##res,   \
 309    (kxdrproc_t) nfsaclsvc_release_##relt,               \
 310    sizeof(struct nfsd3_##argt##args),           \
 311    sizeof(struct nfsd3_##rest##res),            \
 312    0,                                           \
 313    cache,                                       \
 314    respsize,                                    \
 315  }
 316
 317 #define ST 1            /* status*/
 318 #define AT 21           /* attributes */
 319 #define pAT (1+AT)      /* post attributes - conditional */
 320 #define ACL (1+NFS_ACL_MAX_ENTRIES*3)  /* Access Control List */
 321
 322 static struct svc_procedure             nfsd_acl_procedures2[] = {
 323   PROC(null,    void,           void,           void,     RC_NOCACHE, ST),
 324   PROC(getacl,  getacl,         getacl,         getacl,   RC_NOCACHE, ST+1+2*(1+ACL)),
 325   PROC(setacl,  setacl,         attrstat,       fhandle,  RC_NOCACHE, ST+AT),
 326   PROC(getattr, fhandle,        attrstat,       fhandle,  RC_NOCACHE, ST+AT),
 327   PROC(access,  access,         access,         fhandle,  RC_NOCACHE, ST+AT+1),
 328 };
 329
 330 struct svc_version      nfsd_acl_version2 = {
 331                 .vs_vers        = 2,
 332                 .vs_nproc       = 5,
 333                 .vs_proc        = nfsd_acl_procedures2,
 334                 .vs_dispatch    = nfsd_dispatch,
 335                 .vs_xdrsize     = NFS3_SVC_XDRSIZE,
 336                 .vs_hidden      = 1,
 337 };