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 fh_lock(fh); 105 106 error = set_posix_acl(inode, ACL_TYPE_ACCESS, argp->acl_access); 107 if (error) 108 goto out_drop_lock; 109 error = set_posix_acl(inode, ACL_TYPE_DEFAULT, argp->acl_default); 110 111 out_drop_lock: 112 fh_unlock(fh); 113 fh_drop_write(fh); 114 out_errno: 115 resp->status = nfserrno(error); 116 out: 117 /* argp->acl_{access,default} may have been allocated in 118 nfs3svc_decode_setaclargs. */ 119 posix_acl_release(argp->acl_access); 120 posix_acl_release(argp->acl_default); 121 return rpc_success; 122 } 123 124 /* 125 * XDR decode functions 126 */ 127 static int nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p) 128 { 129 struct nfsd3_getaclargs *args = rqstp->rq_argp; 130 131 p = nfs3svc_decode_fh(p, &args->fh); 132 if (!p) 133 return 0; 134 args->mask = ntohl(*p); p++; 135 136 return xdr_argsize_check(rqstp, p); 137 } 138 139 140 static int nfs3svc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p) 141 { 142 struct nfsd3_setaclargs *args = rqstp->rq_argp; 143 struct kvec *head = rqstp->rq_arg.head; 144 unsigned int base; 145 int n; 146 147 p = nfs3svc_decode_fh(p, &args->fh); 148 if (!p) 149 return 0; 150 args->mask = ntohl(*p++); 151 if (args->mask & ~NFS_ACL_MASK || 152 !xdr_argsize_check(rqstp, p)) 153 return 0; 154 155 base = (char *)p - (char *)head->iov_base; 156 n = nfsacl_decode(&rqstp->rq_arg, base, NULL, 157 (args->mask & NFS_ACL) ? 158 &args->acl_access : NULL); 159 if (n > 0) 160 n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL, 161 (args->mask & NFS_DFACL) ? 162 &args->acl_default : NULL); 163 return (n > 0); 164 } 165 166 /* 167 * XDR encode functions 168 */ 169 170 /* GETACL */ 171 static int nfs3svc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p) 172 { 173 struct nfsd3_getaclres *resp = rqstp->rq_resp; 174 struct dentry *dentry = resp->fh.fh_dentry; 175 176 *p++ = resp->status; 177 p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh); 178 if (resp->status == 0 && dentry && d_really_is_positive(dentry)) { 179 struct inode *inode = d_inode(dentry); 180 struct kvec *head = rqstp->rq_res.head; 181 unsigned int base; 182 int n; 183 int w; 184 185 *p++ = htonl(resp->mask); 186 if (!xdr_ressize_check(rqstp, p)) 187 return 0; 188 base = (char *)p - (char *)head->iov_base; 189 190 rqstp->rq_res.page_len = w = nfsacl_size( 191 (resp->mask & NFS_ACL) ? resp->acl_access : NULL, 192 (resp->mask & NFS_DFACL) ? resp->acl_default : NULL); 193 while (w > 0) { 194 if (!*(rqstp->rq_next_page++)) 195 return 0; 196 w -= PAGE_SIZE; 197 } 198 199 n = nfsacl_encode(&rqstp->rq_res, base, inode, 200 resp->acl_access, 201 resp->mask & NFS_ACL, 0); 202 if (n > 0) 203 n = nfsacl_encode(&rqstp->rq_res, base + n, inode, 204 resp->acl_default, 205 resp->mask & NFS_DFACL, 206 NFS_ACL_DEFAULT); 207 if (n <= 0) 208 return 0; 209 } else 210 if (!xdr_ressize_check(rqstp, p)) 211 return 0; 212 213 return 1; 214 } 215 216 /* SETACL */ 217 static int nfs3svc_encode_setaclres(struct svc_rqst *rqstp, __be32 *p) 218 { 219 struct nfsd3_attrstat *resp = rqstp->rq_resp; 220 221 *p++ = resp->status; 222 p = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh); 223 return xdr_ressize_check(rqstp, p); 224 } 225 226 /* 227 * XDR release functions 228 */ 229 static void nfs3svc_release_getacl(struct svc_rqst *rqstp) 230 { 231 struct nfsd3_getaclres *resp = rqstp->rq_resp; 232 233 fh_put(&resp->fh); 234 posix_acl_release(resp->acl_access); 235 posix_acl_release(resp->acl_default); 236 } 237 238 struct nfsd3_voidargs { int dummy; }; 239 240 #define ST 1 /* status*/ 241 #define AT 21 /* attributes */ 242 #define pAT (1+AT) /* post attributes - conditional */ 243 #define ACL (1+NFS_ACL_MAX_ENTRIES*3) /* Access Control List */ 244 245 static const struct svc_procedure nfsd_acl_procedures3[3] = { 246 [ACLPROC3_NULL] = { 247 .pc_func = nfsd3_proc_null, 248 .pc_decode = nfs3svc_decode_voidarg, 249 .pc_encode = nfs3svc_encode_voidres, 250 .pc_argsize = sizeof(struct nfsd3_voidargs), 251 .pc_ressize = sizeof(struct nfsd3_voidargs), 252 .pc_cachetype = RC_NOCACHE, 253 .pc_xdrressize = ST, 254 }, 255 [ACLPROC3_GETACL] = { 256 .pc_func = nfsd3_proc_getacl, 257 .pc_decode = nfs3svc_decode_getaclargs, 258 .pc_encode = nfs3svc_encode_getaclres, 259 .pc_release = nfs3svc_release_getacl, 260 .pc_argsize = sizeof(struct nfsd3_getaclargs), 261 .pc_ressize = sizeof(struct nfsd3_getaclres), 262 .pc_cachetype = RC_NOCACHE, 263 .pc_xdrressize = ST+1+2*(1+ACL), 264 }, 265 [ACLPROC3_SETACL] = { 266 .pc_func = nfsd3_proc_setacl, 267 .pc_decode = nfs3svc_decode_setaclargs, 268 .pc_encode = nfs3svc_encode_setaclres, 269 .pc_release = nfs3svc_release_fhandle, 270 .pc_argsize = sizeof(struct nfsd3_setaclargs), 271 .pc_ressize = sizeof(struct nfsd3_attrstat), 272 .pc_cachetype = RC_NOCACHE, 273 .pc_xdrressize = ST+pAT, 274 }, 275 }; 276 277 static unsigned int nfsd_acl_count3[ARRAY_SIZE(nfsd_acl_procedures3)]; 278 const struct svc_version nfsd_acl_version3 = { 279 .vs_vers = 3, 280 .vs_nproc = 3, 281 .vs_proc = nfsd_acl_procedures3, 282 .vs_count = nfsd_acl_count3, 283 .vs_dispatch = nfsd_dispatch, 284 .vs_xdrsize = NFS3_SVC_XDRSIZE, 285 }; 286 287