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)
  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 {
  32         struct nfsd3_getaclargs *argp = rqstp->rq_argp;
  33         struct nfsd3_getaclres *resp = rqstp->rq_resp;
  34         struct posix_acl *acl;
  35         struct inode *inode;
  36         svc_fh *fh;
  37         __be32 nfserr = 0;
  38
  39         dprintk("nfsd: GETACL(2acl)   %s\n", SVCFH_fmt(&argp->fh));
  40
  41         fh = fh_copy(&resp->fh, &argp->fh);
  42         nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
  43         if (nfserr)
  44                 RETURN_STATUS(nfserr);
  45
  46         inode = d_inode(fh->fh_dentry);
  47
  48         if (argp->mask & ~NFS_ACL_MASK)
  49                 RETURN_STATUS(nfserr_inval);
  50         resp->mask = argp->mask;
  51
  52         nfserr = fh_getattr(fh, &resp->stat);
  53         if (nfserr)
  54                 RETURN_STATUS(nfserr);
  55
  56         if (resp->mask & (NFS_ACL|NFS_ACLCNT)) {
  57                 acl = get_acl(inode, ACL_TYPE_ACCESS);
  58                 if (acl == NULL) {
  59                         /* Solaris returns the inode's minimum ACL. */
  60                         acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
  61                 }
  62                 if (IS_ERR(acl)) {
  63                         nfserr = nfserrno(PTR_ERR(acl));
  64                         goto fail;
  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                 acl = get_acl(inode, ACL_TYPE_DEFAULT);
  72                 if (IS_ERR(acl)) {
  73                         nfserr = nfserrno(PTR_ERR(acl));
  74                         goto fail;
  75                 }
  76                 resp->acl_default = acl;
  77         }
  78
  79         /* resp->acl_{access,default} are released in nfssvc_release_getacl. */
  80         RETURN_STATUS(0);
  81
  82 fail:
  83         posix_acl_release(resp->acl_access);
  84         posix_acl_release(resp->acl_default);
  85         RETURN_STATUS(nfserr);
  86 }
  87
  88 /*
  89  * Set the Access and/or Default ACL of a file.
  90  */
  91 static __be32 nfsacld_proc_setacl(struct svc_rqst *rqstp)
  92 {
  93         struct nfsd3_setaclargs *argp = rqstp->rq_argp;
  94         struct nfsd_attrstat *resp = rqstp->rq_resp;
  95         struct inode *inode;
  96         svc_fh *fh;
  97         __be32 nfserr = 0;
  98         int error;
  99
 100         dprintk("nfsd: SETACL(2acl)   %s\n", SVCFH_fmt(&argp->fh));
 101
 102         fh = fh_copy(&resp->fh, &argp->fh);
 103         nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
 104         if (nfserr)
 105                 goto out;
 106
 107         inode = d_inode(fh->fh_dentry);
 108
 109         error = fh_want_write(fh);
 110         if (error)
 111                 goto out_errno;
 112
 113         fh_lock(fh);
 114
 115         error = set_posix_acl(inode, ACL_TYPE_ACCESS, argp->acl_access);
 116         if (error)
 117                 goto out_drop_lock;
 118         error = set_posix_acl(inode, ACL_TYPE_DEFAULT, argp->acl_default);
 119         if (error)
 120                 goto out_drop_lock;
 121
 122         fh_unlock(fh);
 123
 124         fh_drop_write(fh);
 125
 126         nfserr = fh_getattr(fh, &resp->stat);
 127
 128 out:
 129         /* argp->acl_{access,default} may have been allocated in
 130            nfssvc_decode_setaclargs. */
 131         posix_acl_release(argp->acl_access);
 132         posix_acl_release(argp->acl_default);
 133         return nfserr;
 134 out_drop_lock:
 135         fh_unlock(fh);
 136         fh_drop_write(fh);
 137 out_errno:
 138         nfserr = nfserrno(error);
 139         goto out;
 140 }
 141
 142 /*
 143  * Check file attributes
 144  */
 145 static __be32 nfsacld_proc_getattr(struct svc_rqst *rqstp)
 146 {
 147         struct nfsd_fhandle *argp = rqstp->rq_argp;
 148         struct nfsd_attrstat *resp = rqstp->rq_resp;
 149         __be32 nfserr;
 150         dprintk("nfsd: GETATTR  %s\n", SVCFH_fmt(&argp->fh));
 151
 152         fh_copy(&resp->fh, &argp->fh);
 153         nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP);
 154         if (nfserr)
 155                 return nfserr;
 156         nfserr = fh_getattr(&resp->fh, &resp->stat);
 157         return nfserr;
 158 }
 159
 160 /*
 161  * Check file access
 162  */
 163 static __be32 nfsacld_proc_access(struct svc_rqst *rqstp)
 164 {
 165         struct nfsd3_accessargs *argp = rqstp->rq_argp;
 166         struct nfsd3_accessres *resp = rqstp->rq_resp;
 167         __be32 nfserr;
 168
 169         dprintk("nfsd: ACCESS(2acl)   %s 0x%x\n",
 170                         SVCFH_fmt(&argp->fh),
 171                         argp->access);
 172
 173         fh_copy(&resp->fh, &argp->fh);
 174         resp->access = argp->access;
 175         nfserr = nfsd_access(rqstp, &resp->fh, &resp->access, NULL);
 176         if (nfserr)
 177                 return nfserr;
 178         nfserr = fh_getattr(&resp->fh, &resp->stat);
 179         return nfserr;
 180 }
 181
 182 /*
 183  * XDR decode functions
 184  */
 185 static int nfsaclsvc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p)
 186 {
 187         struct nfsd3_getaclargs *argp = rqstp->rq_argp;
 188
 189         p = nfs2svc_decode_fh(p, &argp->fh);
 190         if (!p)
 191                 return 0;
 192         argp->mask = ntohl(*p); p++;
 193
 194         return xdr_argsize_check(rqstp, p);
 195 }
 196
 197
 198 static int nfsaclsvc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p)
 199 {
 200         struct nfsd3_setaclargs *argp = rqstp->rq_argp;
 201         struct kvec *head = rqstp->rq_arg.head;
 202         unsigned int base;
 203         int n;
 204
 205         p = nfs2svc_decode_fh(p, &argp->fh);
 206         if (!p)
 207                 return 0;
 208         argp->mask = ntohl(*p++);
 209         if (argp->mask & ~NFS_ACL_MASK ||
 210             !xdr_argsize_check(rqstp, p))
 211                 return 0;
 212
 213         base = (char *)p - (char *)head->iov_base;
 214         n = nfsacl_decode(&rqstp->rq_arg, base, NULL,
 215                           (argp->mask & NFS_ACL) ?
 216                           &argp->acl_access : NULL);
 217         if (n > 0)
 218                 n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL,
 219                                   (argp->mask & NFS_DFACL) ?
 220                                   &argp->acl_default : NULL);
 221         return (n > 0);
 222 }
 223
 224 static int nfsaclsvc_decode_fhandleargs(struct svc_rqst *rqstp, __be32 *p)
 225 {
 226         struct nfsd_fhandle *argp = rqstp->rq_argp;
 227
 228         p = nfs2svc_decode_fh(p, &argp->fh);
 229         if (!p)
 230                 return 0;
 231         return xdr_argsize_check(rqstp, p);
 232 }
 233
 234 static int nfsaclsvc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p)
 235 {
 236         struct nfsd3_accessargs *argp = rqstp->rq_argp;
 237
 238         p = nfs2svc_decode_fh(p, &argp->fh);
 239         if (!p)
 240                 return 0;
 241         argp->access = ntohl(*p++);
 242
 243         return xdr_argsize_check(rqstp, p);
 244 }
 245
 246 /*
 247  * XDR encode functions
 248  */
 249
 250 /*
 251  * There must be an encoding function for void results so svc_process
 252  * will work properly.
 253  */
 254 static int nfsaclsvc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
 255 {
 256         return xdr_ressize_check(rqstp, p);
 257 }
 258
 259 /* GETACL */
 260 static int nfsaclsvc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p)
 261 {
 262         struct nfsd3_getaclres *resp = rqstp->rq_resp;
 263         struct dentry *dentry = resp->fh.fh_dentry;
 264         struct inode *inode;
 265         struct kvec *head = rqstp->rq_res.head;
 266         unsigned int base;
 267         int n;
 268         int w;
 269
 270         /*
 271          * Since this is version 2, the check for nfserr in
 272          * nfsd_dispatch actually ensures the following cannot happen.
 273          * However, it seems fragile to depend on that.
 274          */
 275         if (dentry == NULL || d_really_is_negative(dentry))
 276                 return 0;
 277         inode = d_inode(dentry);
 278
 279         p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat);
 280         *p++ = htonl(resp->mask);
 281         if (!xdr_ressize_check(rqstp, p))
 282                 return 0;
 283         base = (char *)p - (char *)head->iov_base;
 284
 285         rqstp->rq_res.page_len = w = nfsacl_size(
 286                 (resp->mask & NFS_ACL)   ? resp->acl_access  : NULL,
 287                 (resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
 288         while (w > 0) {
 289                 if (!*(rqstp->rq_next_page++))
 290                         return 0;
 291                 w -= PAGE_SIZE;
 292         }
 293
 294         n = nfsacl_encode(&rqstp->rq_res, base, inode,
 295                           resp->acl_access,
 296                           resp->mask & NFS_ACL, 0);
 297         if (n > 0)
 298                 n = nfsacl_encode(&rqstp->rq_res, base + n, inode,
 299                                   resp->acl_default,
 300                                   resp->mask & NFS_DFACL,
 301                                   NFS_ACL_DEFAULT);
 302         return (n > 0);
 303 }
 304
 305 static int nfsaclsvc_encode_attrstatres(struct svc_rqst *rqstp, __be32 *p)
 306 {
 307         struct nfsd_attrstat *resp = rqstp->rq_resp;
 308
 309         p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat);
 310         return xdr_ressize_check(rqstp, p);
 311 }
 312
 313 /* ACCESS */
 314 static int nfsaclsvc_encode_accessres(struct svc_rqst *rqstp, __be32 *p)
 315 {
 316         struct nfsd3_accessres *resp = rqstp->rq_resp;
 317
 318         p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat);
 319         *p++ = htonl(resp->access);
 320         return xdr_ressize_check(rqstp, p);
 321 }
 322
 323 /*
 324  * XDR release functions
 325  */
 326 static void nfsaclsvc_release_getacl(struct svc_rqst *rqstp)
 327 {
 328         struct nfsd3_getaclres *resp = rqstp->rq_resp;
 329
 330         fh_put(&resp->fh);
 331         posix_acl_release(resp->acl_access);
 332         posix_acl_release(resp->acl_default);
 333 }
 334
 335 static void nfsaclsvc_release_attrstat(struct svc_rqst *rqstp)
 336 {
 337         struct nfsd_attrstat *resp = rqstp->rq_resp;
 338
 339         fh_put(&resp->fh);
 340 }
 341
 342 static void nfsaclsvc_release_access(struct svc_rqst *rqstp)
 343 {
 344         struct nfsd3_accessres *resp = rqstp->rq_resp;
 345
 346         fh_put(&resp->fh);
 347 }
 348
 349 #define nfsaclsvc_decode_voidargs       NULL
 350 #define nfsaclsvc_release_void          NULL
 351 #define nfsd3_fhandleargs       nfsd_fhandle
 352 #define nfsd3_attrstatres       nfsd_attrstat
 353 #define nfsd3_voidres           nfsd3_voidargs
 354 struct nfsd3_voidargs { int dummy; };
 355
 356 #define PROC(name, argt, rest, relt, cache, respsize)                   \
 357 {                                                                       \
 358         .pc_func        = nfsacld_proc_##name,                          \
 359         .pc_decode      = nfsaclsvc_decode_##argt##args,                \
 360         .pc_encode      = nfsaclsvc_encode_##rest##res,                 \
 361         .pc_release     = nfsaclsvc_release_##relt,     \
 362         .pc_argsize     = sizeof(struct nfsd3_##argt##args),            \
 363         .pc_ressize     = sizeof(struct nfsd3_##rest##res),             \
 364         .pc_cachetype   = cache,                                        \
 365         .pc_xdrressize  = respsize,                                     \
 366 }
 367
 368 #define ST 1            /* status*/
 369 #define AT 21           /* attributes */
 370 #define pAT (1+AT)      /* post attributes - conditional */
 371 #define ACL (1+NFS_ACL_MAX_ENTRIES*3)  /* Access Control List */
 372
 373 static const struct svc_procedure nfsd_acl_procedures2[] = {
 374   PROC(null,    void,           void,           void,     RC_NOCACHE, ST),
 375   PROC(getacl,  getacl,         getacl,         getacl,   RC_NOCACHE, ST+1+2*(1+ACL)),
 376   PROC(setacl,  setacl,         attrstat,       attrstat, RC_NOCACHE, ST+AT),
 377   PROC(getattr, fhandle,        attrstat,       attrstat, RC_NOCACHE, ST+AT),
 378   PROC(access,  access,         access,         access,   RC_NOCACHE, ST+AT+1),
 379 };
 380
 381 static unsigned int nfsd_acl_count2[ARRAY_SIZE(nfsd_acl_procedures2)];
 382 const struct svc_version nfsd_acl_version2 = {
 383         .vs_vers        = 2,
 384         .vs_nproc       = 5,
 385         .vs_proc        = nfsd_acl_procedures2,
 386         .vs_count       = nfsd_acl_count2,
 387         .vs_dispatch    = nfsd_dispatch,
 388         .vs_xdrsize     = NFS3_SVC_XDRSIZE,
 389 };