1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Process version 3 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 /* 17 * NULL call. 18 */ 19 static __be32 20 nfsd3_proc_null(struct svc_rqst *rqstp) 21 { 22 return rpc_success; 23 } 24 25 /* 26 * Get the Access and/or Default ACL of a file. 27 */ 28 static __be32 nfsd3_proc_getacl(struct svc_rqst *rqstp) 29 { 30 struct nfsd3_getaclargs *argp = rqstp->rq_argp; 31 struct nfsd3_getaclres *resp = rqstp->rq_resp; 32 struct posix_acl *acl; 33 struct inode *inode; 34 svc_fh *fh; 35 36 fh = fh_copy(&resp->fh, &argp->fh); 37 resp->status = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP); 38 if (resp->status != nfs_ok) 39 goto out; 40 41 inode = d_inode(fh->fh_dentry); 42 43 if (argp->mask & ~NFS_ACL_MASK) { 44 resp->status = nfserr_inval; 45 goto out; 46 } 47 resp->mask = argp->mask; 48 49 if (resp->mask & (NFS_ACL|NFS_ACLCNT)) { 50 acl = get_acl(inode, ACL_TYPE_ACCESS); 51 if (acl == NULL) { 52 /* Solaris returns the inode's minimum ACL. */ 53 acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); 54 } 55 if (IS_ERR(acl)) { 56 resp->status = nfserrno(PTR_ERR(acl)); 57 goto fail; 58 } 59 resp->acl_access = acl; 60 } 61 if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) { 62 /* Check how Solaris handles requests for the Default ACL 63 of a non-directory! */ 64 acl = get_acl(inode, ACL_TYPE_DEFAULT); 65 if (IS_ERR(acl)) { 66 resp->status = nfserrno(PTR_ERR(acl)); 67 goto fail; 68 } 69 resp->acl_default = acl; 70 } 71 72 /* resp->acl_{access,default} are released in nfs3svc_release_getacl. */ 73 out: 74 return rpc_success; 75 76 fail: 77 posix_acl_release(resp->acl_access); 78 posix_acl_release(resp->acl_default); 79 goto out; 80 } 81 82 /* 83 * Set the Access and/or Default ACL of a file. 84 */ 85 static __be32 nfsd3_proc_setacl(struct svc_rqst *rqstp) 86 { 87 struct nfsd3_setaclargs *argp = rqstp->rq_argp; 88 struct nfsd3_attrstat *resp = rqstp->rq_resp; 89 struct inode *inode; 90 svc_fh *fh; 91 int error; 92 93 fh = fh_copy(&resp->fh, &argp->fh); 94 resp->status = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR); 95 if (resp->status != nfs_ok) 96 goto out; 97 98 inode = d_inode(fh->fh_dentry); 99 100 error = fh_want_write(fh); 101 if (error) 102 goto out_errno; 103 104 inode_lock(inode); 105 106 error = set_posix_acl(&init_user_ns, inode, ACL_TYPE_ACCESS, 107 argp->acl_access); 108 if (error) 109 goto out_drop_lock; 110 error = set_posix_acl(&init_user_ns, inode, ACL_TYPE_DEFAULT, 111 argp->acl_default); 112 113 out_drop_lock: 114 inode_unlock(inode); 115 fh_drop_write(fh); 116 out_errno: 117 resp->status = nfserrno(error); 118 out: 119 /* argp->acl_{access,default} may have been allocated in 120 nfs3svc_decode_setaclargs. */ 121 posix_acl_release(argp->acl_access); 122 posix_acl_release(argp->acl_default); 123 return rpc_success; 124 } 125 126 /* 127 * XDR decode functions 128 */ 129 130 static bool 131 nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, struct xdr_stream *xdr) 132 { 133 struct nfsd3_getaclargs *args = rqstp->rq_argp; 134 135 if (!svcxdr_decode_nfs_fh3(xdr, &args->fh)) 136 return false; 137 if (xdr_stream_decode_u32(xdr, &args->mask) < 0) 138 return false; 139 140 return true; 141 } 142 143 static bool 144 nfs3svc_decode_setaclargs(struct svc_rqst *rqstp, struct xdr_stream *xdr) 145 { 146 struct nfsd3_setaclargs *argp = rqstp->rq_argp; 147 148 if (!svcxdr_decode_nfs_fh3(xdr, &argp->fh)) 149 return false; 150 if (xdr_stream_decode_u32(xdr, &argp->mask) < 0) 151 return false; 152 if (argp->mask & ~NFS_ACL_MASK) 153 return false; 154 if (!nfs_stream_decode_acl(xdr, NULL, (argp->mask & NFS_ACL) ? 155 &argp->acl_access : NULL)) 156 return false; 157 if (!nfs_stream_decode_acl(xdr, NULL, (argp->mask & NFS_DFACL) ? 158 &argp->acl_default : NULL)) 159 return false; 160 161 return true; 162 } 163 164 /* 165 * XDR encode functions 166 */ 167 168 /* GETACL */ 169 static bool 170 nfs3svc_encode_getaclres(struct svc_rqst *rqstp, struct xdr_stream *xdr) 171 { 172 struct nfsd3_getaclres *resp = rqstp->rq_resp; 173 struct dentry *dentry = resp->fh.fh_dentry; 174 struct kvec *head = rqstp->rq_res.head; 175 struct inode *inode; 176 unsigned int base; 177 int n; 178 int w; 179 180 if (!svcxdr_encode_nfsstat3(xdr, resp->status)) 181 return false; 182 switch (resp->status) { 183 case nfs_ok: 184 inode = d_inode(dentry); 185 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh)) 186 return false; 187 if (xdr_stream_encode_u32(xdr, resp->mask) < 0) 188 return false; 189 190 base = (char *)xdr->p - (char *)head->iov_base; 191 192 rqstp->rq_res.page_len = w = nfsacl_size( 193 (resp->mask & NFS_ACL) ? resp->acl_access : NULL, 194 (resp->mask & NFS_DFACL) ? resp->acl_default : NULL); 195 while (w > 0) { 196 if (!*(rqstp->rq_next_page++)) 197 return false; 198 w -= PAGE_SIZE; 199 } 200 201 n = nfsacl_encode(&rqstp->rq_res, base, inode, 202 resp->acl_access, 203 resp->mask & NFS_ACL, 0); 204 if (n > 0) 205 n = nfsacl_encode(&rqstp->rq_res, base + n, inode, 206 resp->acl_default, 207 resp->mask & NFS_DFACL, 208 NFS_ACL_DEFAULT); 209 if (n <= 0) 210 return false; 211 break; 212 default: 213 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh)) 214 return false; 215 } 216 217 return true; 218 } 219 220 /* SETACL */ 221 static bool 222 nfs3svc_encode_setaclres(struct svc_rqst *rqstp, struct xdr_stream *xdr) 223 { 224 struct nfsd3_attrstat *resp = rqstp->rq_resp; 225 226 return svcxdr_encode_nfsstat3(xdr, resp->status) && 227 svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh); 228 } 229 230 /* 231 * XDR release functions 232 */ 233 static void nfs3svc_release_getacl(struct svc_rqst *rqstp) 234 { 235 struct nfsd3_getaclres *resp = rqstp->rq_resp; 236 237 fh_put(&resp->fh); 238 posix_acl_release(resp->acl_access); 239 posix_acl_release(resp->acl_default); 240 } 241 242 struct nfsd3_voidargs { int dummy; }; 243 244 #define ST 1 /* status*/ 245 #define AT 21 /* attributes */ 246 #define pAT (1+AT) /* post attributes - conditional */ 247 #define ACL (1+NFS_ACL_MAX_ENTRIES*3) /* Access Control List */ 248 249 static const struct svc_procedure nfsd_acl_procedures3[3] = { 250 [ACLPROC3_NULL] = { 251 .pc_func = nfsd3_proc_null, 252 .pc_decode = nfssvc_decode_voidarg, 253 .pc_encode = nfssvc_encode_voidres, 254 .pc_argsize = sizeof(struct nfsd_voidargs), 255 .pc_argzero = sizeof(struct nfsd_voidargs), 256 .pc_ressize = sizeof(struct nfsd_voidres), 257 .pc_cachetype = RC_NOCACHE, 258 .pc_xdrressize = ST, 259 .pc_name = "NULL", 260 }, 261 [ACLPROC3_GETACL] = { 262 .pc_func = nfsd3_proc_getacl, 263 .pc_decode = nfs3svc_decode_getaclargs, 264 .pc_encode = nfs3svc_encode_getaclres, 265 .pc_release = nfs3svc_release_getacl, 266 .pc_argsize = sizeof(struct nfsd3_getaclargs), 267 .pc_argzero = sizeof(struct nfsd3_getaclargs), 268 .pc_ressize = sizeof(struct nfsd3_getaclres), 269 .pc_cachetype = RC_NOCACHE, 270 .pc_xdrressize = ST+1+2*(1+ACL), 271 .pc_name = "GETACL", 272 }, 273 [ACLPROC3_SETACL] = { 274 .pc_func = nfsd3_proc_setacl, 275 .pc_decode = nfs3svc_decode_setaclargs, 276 .pc_encode = nfs3svc_encode_setaclres, 277 .pc_release = nfs3svc_release_fhandle, 278 .pc_argsize = sizeof(struct nfsd3_setaclargs), 279 .pc_argzero = sizeof(struct nfsd3_setaclargs), 280 .pc_ressize = sizeof(struct nfsd3_attrstat), 281 .pc_cachetype = RC_NOCACHE, 282 .pc_xdrressize = ST+pAT, 283 .pc_name = "SETACL", 284 }, 285 }; 286 287 static unsigned int nfsd_acl_count3[ARRAY_SIZE(nfsd_acl_procedures3)]; 288 const struct svc_version nfsd_acl_version3 = { 289 .vs_vers = 3, 290 .vs_nproc = 3, 291 .vs_proc = nfsd_acl_procedures3, 292 .vs_count = nfsd_acl_count3, 293 .vs_dispatch = nfsd_dispatch, 294 .vs_xdrsize = NFS3_SVC_XDRSIZE, 295 }; 296 297