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 }; 390