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         svc_fh *fh;
  34         struct posix_acl *acl;
  35         __be32 nfserr = 0;
  36
  37         dprintk("nfsd: GETACL(2acl)   %s\n", SVCFH_fmt(&argp->fh));
  38
  39         fh = fh_copy(&resp->fh, &argp->fh);
  40         nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
  41         if (nfserr)
  42                 RETURN_STATUS(nfserr);
  43
  44         if (argp->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
  45                 RETURN_STATUS(nfserr_inval);
  46         resp->mask = argp->mask;
  47
  48         if (resp->mask & (NFS_ACL|NFS_ACLCNT)) {
  49                 acl = nfsd_get_posix_acl(fh, ACL_TYPE_ACCESS);
  50                 if (IS_ERR(acl)) {
  51                         int err = PTR_ERR(acl);
  52
  53                         if (err == -ENODATA || err == -EOPNOTSUPP)
  54                                 acl = NULL;
  55                         else {
  56                                 nfserr = nfserrno(err);
  57                                 goto fail;
  58                         }
  59                 }
  60                 if (acl == NULL) {
  61                         /* Solaris returns the inode's minimum ACL. */
  62
  63                         struct inode *inode = fh->fh_dentry->d_inode;
  64                         acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
  65                 }
  66                 resp->acl_access = acl;
  67         }
  68         if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) {
  69                 /* Check how Solaris handles requests for the Default ACL
  70                    of a non-directory! */
  71
  72                 acl = nfsd_get_posix_acl(fh, ACL_TYPE_DEFAULT);
  73                 if (IS_ERR(acl)) {
  74                         int err = PTR_ERR(acl);
  75
  76                         if (err == -ENODATA || err == -EOPNOTSUPP)
  77                                 acl = NULL;
  78                         else {
  79                                 nfserr = nfserrno(err);
  80                                 goto fail;
  81                         }
  82                 }
  83                 resp->acl_default = acl;
  84         }
  85
  86         /* resp->acl_{access,default} are released in nfssvc_release_getacl. */
  87         RETURN_STATUS(0);
  88
  89 fail:
  90         posix_acl_release(resp->acl_access);
  91         posix_acl_release(resp->acl_default);
  92         RETURN_STATUS(nfserr);
  93 }
  94
  95 /*
  96  * Set the Access and/or Default ACL of a file.
  97  */
  98 static __be32 nfsacld_proc_setacl(struct svc_rqst * rqstp,
  99                 struct nfsd3_setaclargs *argp,
 100                 struct nfsd_attrstat *resp)
 101 {
 102         svc_fh *fh;
 103         __be32 nfserr = 0;
 104
 105         dprintk("nfsd: SETACL(2acl)   %s\n", SVCFH_fmt(&argp->fh));
 106
 107         fh = fh_copy(&resp->fh, &argp->fh);
 108         nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
 109
 110         if (!nfserr) {
 111                 nfserr = nfserrno( nfsd_set_posix_acl(
 112                         fh, ACL_TYPE_ACCESS, argp->acl_access) );
 113         }
 114         if (!nfserr) {
 115                 nfserr = nfserrno( nfsd_set_posix_acl(
 116                         fh, ACL_TYPE_DEFAULT, argp->acl_default) );
 117         }
 118
 119         /* argp->acl_{access,default} may have been allocated in
 120            nfssvc_decode_setaclargs. */
 121         posix_acl_release(argp->acl_access);
 122         posix_acl_release(argp->acl_default);
 123         return nfserr;
 124 }
 125
 126 /*
 127  * Check file attributes
 128  */
 129 static __be32 nfsacld_proc_getattr(struct svc_rqst * rqstp,
 130                 struct nfsd_fhandle *argp, struct nfsd_attrstat *resp)
 131 {
 132         dprintk("nfsd: GETATTR  %s\n", SVCFH_fmt(&argp->fh));
 133
 134         fh_copy(&resp->fh, &argp->fh);
 135         return fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
 136 }
 137
 138 /*
 139  * Check file access
 140  */
 141 static __be32 nfsacld_proc_access(struct svc_rqst *rqstp, struct nfsd3_accessargs *argp,
 142                 struct nfsd3_accessres *resp)
 143 {
 144         __be32 nfserr;
 145
 146         dprintk("nfsd: ACCESS(2acl)   %s 0x%x\n",
 147                         SVCFH_fmt(&argp->fh),
 148                         argp->access);
 149
 150         fh_copy(&resp->fh, &argp->fh);
 151         resp->access = argp->access;
 152         nfserr = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
 153         return nfserr;
 154 }
 155
 156 /*
 157  * XDR decode functions
 158  */
 159 static int nfsaclsvc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p,
 160                 struct nfsd3_getaclargs *argp)
 161 {
 162         if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
 163                 return 0;
 164         argp->mask = ntohl(*p); p++;
 165
 166         return xdr_argsize_check(rqstp, p);
 167 }
 168
 169
 170 static int nfsaclsvc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p,
 171                 struct nfsd3_setaclargs *argp)
 172 {
 173         struct kvec *head = rqstp->rq_arg.head;
 174         unsigned int base;
 175         int n;
 176
 177         if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
 178                 return 0;
 179         argp->mask = ntohl(*p++);
 180         if (argp->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT) ||
 181             !xdr_argsize_check(rqstp, p))
 182                 return 0;
 183
 184         base = (char *)p - (char *)head->iov_base;
 185         n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
 186                           (argp->mask & NFS_ACL) ?
 187                           &argp->acl_access : NULL);
 188         if (n > 0)
 189                 n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
 190                                   (argp->mask & NFS_DFACL) ?
 191                                   &argp->acl_default : NULL);
 192         return (n > 0);
 193 }
 194
 195 static int nfsaclsvc_decode_fhandleargs(struct svc_rqst *rqstp, __be32 *p,
 196                 struct nfsd_fhandle *argp)
 197 {
 198         if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
 199                 return 0;
 200         return xdr_argsize_check(rqstp, p);
 201 }
 202
 203 static int nfsaclsvc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p,
 204                 struct nfsd3_accessargs *argp)
 205 {
 206         if (!(p = nfs2svc_decode_fh(p, &argp->fh)))
 207                 return 0;
 208         argp->access = ntohl(*p++);
 209
 210         return xdr_argsize_check(rqstp, p);
 211 }
 212
 213 /*
 214  * XDR encode functions
 215  */
 216
 217 /*
 218  * There must be an encoding function for void results so svc_process
 219  * will work properly.
 220  */
 221 int
 222 nfsaclsvc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
 223 {
 224         return xdr_ressize_check(rqstp, p);
 225 }
 226
 227 /* GETACL */
 228 static int nfsaclsvc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p,
 229                 struct nfsd3_getaclres *resp)
 230 {
 231         struct dentry *dentry = resp->fh.fh_dentry;
 232         struct inode *inode;
 233         struct kvec *head = rqstp->rq_res.head;
 234         unsigned int base;
 235         int n;
 236         int w;
 237
 238         /*
 239          * Since this is version 2, the check for nfserr in
 240          * nfsd_dispatch actually ensures the following cannot happen.
 241          * However, it seems fragile to depend on that.
 242          */
 243         if (dentry == NULL || dentry->d_inode == NULL)
 244                 return 0;
 245         inode = dentry->d_inode;
 246
 247         p = nfs2svc_encode_fattr(rqstp, p, &resp->fh);
 248         *p++ = htonl(resp->mask);
 249         if (!xdr_ressize_check(rqstp, p))
 250                 return 0;
 251         base = (char *)p - (char *)head->iov_base;
 252
 253         rqstp->rq_res.page_len = w = nfsacl_size(
 254                 (resp->mask & NFS_ACL)   ? resp->acl_access  : NULL,
 255                 (resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
 256         while (w > 0) {
 257                 if (!rqstp->rq_respages[rqstp->rq_resused++])
 258                         return 0;
 259                 w -= PAGE_SIZE;
 260         }
 261
 262         n = nfsacl_encode(&rqstp->rq_res, base, inode,
 263                           resp->acl_access,
 264                           resp->mask & NFS_ACL, 0);
 265         if (n > 0)
 266                 n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
 267                                   resp->acl_default,
 268                                   resp->mask & NFS_DFACL,
 269                                   NFS_ACL_DEFAULT);
 270         if (n <= 0)
 271                 return 0;
 272         return 1;
 273 }
 274
 275 static int nfsaclsvc_encode_attrstatres(struct svc_rqst *rqstp, __be32 *p,
 276                 struct nfsd_attrstat *resp)
 277 {
 278         p = nfs2svc_encode_fattr(rqstp, p, &resp->fh);
 279         return xdr_ressize_check(rqstp, p);
 280 }
 281
 282 /* ACCESS */
 283 static int nfsaclsvc_encode_accessres(struct svc_rqst *rqstp, __be32 *p,
 284                 struct nfsd3_accessres *resp)
 285 {
 286         p = nfs2svc_encode_fattr(rqstp, p, &resp->fh);
 287         *p++ = htonl(resp->access);
 288         return xdr_ressize_check(rqstp, p);
 289 }
 290
 291 /*
 292  * XDR release functions
 293  */
 294 static int nfsaclsvc_release_getacl(struct svc_rqst *rqstp, __be32 *p,
 295                 struct nfsd3_getaclres *resp)
 296 {
 297         fh_put(&resp->fh);
 298         posix_acl_release(resp->acl_access);
 299         posix_acl_release(resp->acl_default);
 300         return 1;
 301 }
 302
 303 static int nfsaclsvc_release_attrstat(struct svc_rqst *rqstp, __be32 *p,
 304                 struct nfsd_attrstat *resp)
 305 {
 306         fh_put(&resp->fh);
 307         return 1;
 308 }
 309
 310 static int nfsaclsvc_release_access(struct svc_rqst *rqstp, __be32 *p,
 311                struct nfsd3_accessres *resp)
 312 {
 313        fh_put(&resp->fh);
 314        return 1;
 315 }
 316
 317 #define nfsaclsvc_decode_voidargs       NULL
 318 #define nfsaclsvc_release_void          NULL
 319 #define nfsd3_fhandleargs       nfsd_fhandle
 320 #define nfsd3_attrstatres       nfsd_attrstat
 321 #define nfsd3_voidres           nfsd3_voidargs
 322 struct nfsd3_voidargs { int dummy; };
 323
 324 #define PROC(name, argt, rest, relt, cache, respsize)   \
 325  { (svc_procfunc) nfsacld_proc_##name,          \
 326    (kxdrproc_t) nfsaclsvc_decode_##argt##args,  \
 327    (kxdrproc_t) nfsaclsvc_encode_##rest##res,   \
 328    (kxdrproc_t) nfsaclsvc_release_##relt,               \
 329    sizeof(struct nfsd3_##argt##args),           \
 330    sizeof(struct nfsd3_##rest##res),            \
 331    0,                                           \
 332    cache,                                       \
 333    respsize,                                    \
 334  }
 335
 336 #define ST 1            /* status*/
 337 #define AT 21           /* attributes */
 338 #define pAT (1+AT)      /* post attributes - conditional */
 339 #define ACL (1+NFS_ACL_MAX_ENTRIES*3)  /* Access Control List */
 340
 341 static struct svc_procedure             nfsd_acl_procedures2[] = {
 342   PROC(null,    void,           void,           void,     RC_NOCACHE, ST),
 343   PROC(getacl,  getacl,         getacl,         getacl,   RC_NOCACHE, ST+1+2*(1+ACL)),
 344   PROC(setacl,  setacl,         attrstat,       attrstat, RC_NOCACHE, ST+AT),
 345   PROC(getattr, fhandle,        attrstat,       attrstat, RC_NOCACHE, ST+AT),
 346   PROC(access,  access,         access,         access,   RC_NOCACHE, ST+AT+1),
 347 };
 348
 349 struct svc_version      nfsd_acl_version2 = {
 350                 .vs_vers        = 2,
 351                 .vs_nproc       = 5,
 352                 .vs_proc        = nfsd_acl_procedures2,
 353                 .vs_dispatch    = nfsd_dispatch,
 354                 .vs_xdrsize     = NFS3_SVC_XDRSIZE,
 355                 .vs_hidden      = 0,
 356 };