1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Process version 2 NFSACL requests. 4 * 5 * Copyright (C) 2002-2003 Andreas Gruenbacher <agruen@suse.de> 6 */ 7 8 #include "nfsd.h" 9 /* FIXME: nfsacl.h is a broken header */ 10 #include <linux/nfsacl.h> 11 #include <linux/gfp.h> 12 #include "cache.h" 13 #include "xdr3.h" 14 #include "vfs.h" 15 16 #define NFSDDBG_FACILITY NFSDDBG_PROC 17 #define RETURN_STATUS(st) { resp->status = (st); return (st); } 18 19 /* 20 * NULL call. 21 */ 22 static __be32 23 nfsacld_proc_null(struct svc_rqst *rqstp) 24 { 25 return nfs_ok; 26 } 27 28 /* 29 * Get the Access and/or Default ACL of a file. 30 */ 31 static __be32 nfsacld_proc_getacl(struct svc_rqst *rqstp) 32 { 33 struct nfsd3_getaclargs *argp = rqstp->rq_argp; 34 struct nfsd3_getaclres *resp = rqstp->rq_resp; 35 struct posix_acl *acl; 36 struct inode *inode; 37 svc_fh *fh; 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 nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP); 44 if (nfserr) 45 RETURN_STATUS(nfserr); 46 47 inode = d_inode(fh->fh_dentry); 48 49 if (argp->mask & ~NFS_ACL_MASK) 50 RETURN_STATUS(nfserr_inval); 51 resp->mask = argp->mask; 52 53 nfserr = fh_getattr(fh, &resp->stat); 54 if (nfserr) 55 RETURN_STATUS(nfserr); 56 57 if (resp->mask & (NFS_ACL|NFS_ACLCNT)) { 58 acl = get_acl(inode, ACL_TYPE_ACCESS); 59 if (acl == NULL) { 60 /* Solaris returns the inode's minimum ACL. */ 61 acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); 62 } 63 if (IS_ERR(acl)) { 64 nfserr = nfserrno(PTR_ERR(acl)); 65 goto fail; 66 } 67 resp->acl_access = acl; 68 } 69 if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) { 70 /* Check how Solaris handles requests for the Default ACL 71 of a non-directory! */ 72 acl = get_acl(inode, ACL_TYPE_DEFAULT); 73 if (IS_ERR(acl)) { 74 nfserr = nfserrno(PTR_ERR(acl)); 75 goto fail; 76 } 77 resp->acl_default = acl; 78 } 79 80 /* resp->acl_{access,default} are released in nfssvc_release_getacl. */ 81 RETURN_STATUS(0); 82 83 fail: 84 posix_acl_release(resp->acl_access); 85 posix_acl_release(resp->acl_default); 86 RETURN_STATUS(nfserr); 87 } 88 89 /* 90 * Set the Access and/or Default ACL of a file. 91 */ 92 static __be32 nfsacld_proc_setacl(struct svc_rqst *rqstp) 93 { 94 struct nfsd3_setaclargs *argp = rqstp->rq_argp; 95 struct nfsd_attrstat *resp = rqstp->rq_resp; 96 struct inode *inode; 97 svc_fh *fh; 98 __be32 nfserr = 0; 99 int error; 100 101 dprintk("nfsd: SETACL(2acl) %s\n", SVCFH_fmt(&argp->fh)); 102 103 fh = fh_copy(&resp->fh, &argp->fh); 104 nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR); 105 if (nfserr) 106 goto out; 107 108 inode = d_inode(fh->fh_dentry); 109 110 error = fh_want_write(fh); 111 if (error) 112 goto out_errno; 113 114 fh_lock(fh); 115 116 error = set_posix_acl(inode, ACL_TYPE_ACCESS, argp->acl_access); 117 if (error) 118 goto out_drop_lock; 119 error = set_posix_acl(inode, ACL_TYPE_DEFAULT, argp->acl_default); 120 if (error) 121 goto out_drop_lock; 122 123 fh_unlock(fh); 124 125 fh_drop_write(fh); 126 127 nfserr = fh_getattr(fh, &resp->stat); 128 129 out: 130 /* argp->acl_{access,default} may have been allocated in 131 nfssvc_decode_setaclargs. */ 132 posix_acl_release(argp->acl_access); 133 posix_acl_release(argp->acl_default); 134 return nfserr; 135 out_drop_lock: 136 fh_unlock(fh); 137 fh_drop_write(fh); 138 out_errno: 139 nfserr = nfserrno(error); 140 goto out; 141 } 142 143 /* 144 * Check file attributes 145 */ 146 static __be32 nfsacld_proc_getattr(struct svc_rqst *rqstp) 147 { 148 struct nfsd_fhandle *argp = rqstp->rq_argp; 149 struct nfsd_attrstat *resp = rqstp->rq_resp; 150 __be32 nfserr; 151 dprintk("nfsd: GETATTR %s\n", SVCFH_fmt(&argp->fh)); 152 153 fh_copy(&resp->fh, &argp->fh); 154 nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP); 155 if (nfserr) 156 return nfserr; 157 nfserr = fh_getattr(&resp->fh, &resp->stat); 158 return nfserr; 159 } 160 161 /* 162 * Check file access 163 */ 164 static __be32 nfsacld_proc_access(struct svc_rqst *rqstp) 165 { 166 struct nfsd3_accessargs *argp = rqstp->rq_argp; 167 struct nfsd3_accessres *resp = rqstp->rq_resp; 168 __be32 nfserr; 169 170 dprintk("nfsd: ACCESS(2acl) %s 0x%x\n", 171 SVCFH_fmt(&argp->fh), 172 argp->access); 173 174 fh_copy(&resp->fh, &argp->fh); 175 resp->access = argp->access; 176 nfserr = nfsd_access(rqstp, &resp->fh, &resp->access, NULL); 177 if (nfserr) 178 return nfserr; 179 nfserr = fh_getattr(&resp->fh, &resp->stat); 180 return nfserr; 181 } 182 183 /* 184 * XDR decode functions 185 */ 186 static int nfsaclsvc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p) 187 { 188 struct nfsd3_getaclargs *argp = rqstp->rq_argp; 189 190 p = nfs2svc_decode_fh(p, &argp->fh); 191 if (!p) 192 return 0; 193 argp->mask = ntohl(*p); p++; 194 195 return xdr_argsize_check(rqstp, p); 196 } 197 198 199 static int nfsaclsvc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p) 200 { 201 struct nfsd3_setaclargs *argp = rqstp->rq_argp; 202 struct kvec *head = rqstp->rq_arg.head; 203 unsigned int base; 204 int n; 205 206 p = nfs2svc_decode_fh(p, &argp->fh); 207 if (!p) 208 return 0; 209 argp->mask = ntohl(*p++); 210 if (argp->mask & ~NFS_ACL_MASK || 211 !xdr_argsize_check(rqstp, p)) 212 return 0; 213 214 base = (char *)p - (char *)head->iov_base; 215 n = nfsacl_decode(&rqstp->rq_arg, base, NULL, 216 (argp->mask & NFS_ACL) ? 217 &argp->acl_access : NULL); 218 if (n > 0) 219 n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL, 220 (argp->mask & NFS_DFACL) ? 221 &argp->acl_default : NULL); 222 return (n > 0); 223 } 224 225 static int nfsaclsvc_decode_fhandleargs(struct svc_rqst *rqstp, __be32 *p) 226 { 227 struct nfsd_fhandle *argp = rqstp->rq_argp; 228 229 p = nfs2svc_decode_fh(p, &argp->fh); 230 if (!p) 231 return 0; 232 return xdr_argsize_check(rqstp, p); 233 } 234 235 static int nfsaclsvc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p) 236 { 237 struct nfsd3_accessargs *argp = rqstp->rq_argp; 238 239 p = nfs2svc_decode_fh(p, &argp->fh); 240 if (!p) 241 return 0; 242 argp->access = ntohl(*p++); 243 244 return xdr_argsize_check(rqstp, p); 245 } 246 247 /* 248 * XDR encode functions 249 */ 250 251 /* 252 * There must be an encoding function for void results so svc_process 253 * will work properly. 254 */ 255 static int nfsaclsvc_encode_voidres(struct svc_rqst *rqstp, __be32 *p) 256 { 257 return xdr_ressize_check(rqstp, p); 258 } 259 260 /* GETACL */ 261 static int nfsaclsvc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p) 262 { 263 struct nfsd3_getaclres *resp = rqstp->rq_resp; 264 struct dentry *dentry = resp->fh.fh_dentry; 265 struct inode *inode; 266 struct kvec *head = rqstp->rq_res.head; 267 unsigned int base; 268 int n; 269 int w; 270 271 /* 272 * Since this is version 2, the check for nfserr in 273 * nfsd_dispatch actually ensures the following cannot happen. 274 * However, it seems fragile to depend on that. 275 */ 276 if (dentry == NULL || d_really_is_negative(dentry)) 277 return 0; 278 inode = d_inode(dentry); 279 280 p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat); 281 *p++ = htonl(resp->mask); 282 if (!xdr_ressize_check(rqstp, p)) 283 return 0; 284 base = (char *)p - (char *)head->iov_base; 285 286 rqstp->rq_res.page_len = w = nfsacl_size( 287 (resp->mask & NFS_ACL) ? resp->acl_access : NULL, 288 (resp->mask & NFS_DFACL) ? resp->acl_default : NULL); 289 while (w > 0) { 290 if (!*(rqstp->rq_next_page++)) 291 return 0; 292 w -= PAGE_SIZE; 293 } 294 295 n = nfsacl_encode(&rqstp->rq_res, base, inode, 296 resp->acl_access, 297 resp->mask & NFS_ACL, 0); 298 if (n > 0) 299 n = nfsacl_encode(&rqstp->rq_res, base + n, inode, 300 resp->acl_default, 301 resp->mask & NFS_DFACL, 302 NFS_ACL_DEFAULT); 303 return (n > 0); 304 } 305 306 static int nfsaclsvc_encode_attrstatres(struct svc_rqst *rqstp, __be32 *p) 307 { 308 struct nfsd_attrstat *resp = rqstp->rq_resp; 309 310 p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat); 311 return xdr_ressize_check(rqstp, p); 312 } 313 314 /* ACCESS */ 315 static int nfsaclsvc_encode_accessres(struct svc_rqst *rqstp, __be32 *p) 316 { 317 struct nfsd3_accessres *resp = rqstp->rq_resp; 318 319 p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat); 320 *p++ = htonl(resp->access); 321 return xdr_ressize_check(rqstp, p); 322 } 323 324 /* 325 * XDR release functions 326 */ 327 static void nfsaclsvc_release_getacl(struct svc_rqst *rqstp) 328 { 329 struct nfsd3_getaclres *resp = rqstp->rq_resp; 330 331 fh_put(&resp->fh); 332 posix_acl_release(resp->acl_access); 333 posix_acl_release(resp->acl_default); 334 } 335 336 static void nfsaclsvc_release_attrstat(struct svc_rqst *rqstp) 337 { 338 struct nfsd_attrstat *resp = rqstp->rq_resp; 339 340 fh_put(&resp->fh); 341 } 342 343 static void nfsaclsvc_release_access(struct svc_rqst *rqstp) 344 { 345 struct nfsd3_accessres *resp = rqstp->rq_resp; 346 347 fh_put(&resp->fh); 348 } 349 350 #define nfsaclsvc_decode_voidargs NULL 351 #define nfsaclsvc_release_void NULL 352 #define nfsd3_fhandleargs nfsd_fhandle 353 #define nfsd3_attrstatres nfsd_attrstat 354 #define nfsd3_voidres nfsd3_voidargs 355 struct nfsd3_voidargs { int dummy; }; 356 357 #define PROC(name, argt, rest, relt, cache, respsize) \ 358 { \ 359 .pc_func = nfsacld_proc_##name, \ 360 .pc_decode = nfsaclsvc_decode_##argt##args, \ 361 .pc_encode = nfsaclsvc_encode_##rest##res, \ 362 .pc_release = nfsaclsvc_release_##relt, \ 363 .pc_argsize = sizeof(struct nfsd3_##argt##args), \ 364 .pc_ressize = sizeof(struct nfsd3_##rest##res), \ 365 .pc_cachetype = cache, \ 366 .pc_xdrressize = respsize, \ 367 } 368 369 #define ST 1 /* status*/ 370 #define AT 21 /* attributes */ 371 #define pAT (1+AT) /* post attributes - conditional */ 372 #define ACL (1+NFS_ACL_MAX_ENTRIES*3) /* Access Control List */ 373 374 static const struct svc_procedure nfsd_acl_procedures2[] = { 375 PROC(null, void, void, void, RC_NOCACHE, ST), 376 PROC(getacl, getacl, getacl, getacl, RC_NOCACHE, ST+1+2*(1+ACL)), 377 PROC(setacl, setacl, attrstat, attrstat, RC_NOCACHE, ST+AT), 378 PROC(getattr, fhandle, attrstat, attrstat, RC_NOCACHE, ST+AT), 379 PROC(access, access, access, access, RC_NOCACHE, ST+AT+1), 380 }; 381 382 static unsigned int nfsd_acl_count2[ARRAY_SIZE(nfsd_acl_procedures2)]; 383 const struct svc_version nfsd_acl_version2 = { 384 .vs_vers = 2, 385 .vs_nproc = 5, 386 .vs_proc = nfsd_acl_procedures2, 387 .vs_count = nfsd_acl_count2, 388 .vs_dispatch = nfsd_dispatch, 389 .vs_xdrsize = NFS3_SVC_XDRSIZE, 390 }; 391