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 #define RETURN_STATUS(st) { resp->status = (st); return (st); } 17 18 /* 19 * NULL call. 20 */ 21 static __be32 22 nfsd3_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 nfsd3_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 fh = fh_copy(&resp->fh, &argp->fh); 40 nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP); 41 if (nfserr) 42 RETURN_STATUS(nfserr); 43 44 inode = d_inode(fh->fh_dentry); 45 46 if (argp->mask & ~NFS_ACL_MASK) 47 RETURN_STATUS(nfserr_inval); 48 resp->mask = argp->mask; 49 50 if (resp->mask & (NFS_ACL|NFS_ACLCNT)) { 51 acl = get_acl(inode, ACL_TYPE_ACCESS); 52 if (acl == NULL) { 53 /* Solaris returns the inode's minimum ACL. */ 54 acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); 55 } 56 if (IS_ERR(acl)) { 57 nfserr = nfserrno(PTR_ERR(acl)); 58 goto fail; 59 } 60 resp->acl_access = acl; 61 } 62 if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) { 63 /* Check how Solaris handles requests for the Default ACL 64 of a non-directory! */ 65 acl = get_acl(inode, ACL_TYPE_DEFAULT); 66 if (IS_ERR(acl)) { 67 nfserr = nfserrno(PTR_ERR(acl)); 68 goto fail; 69 } 70 resp->acl_default = acl; 71 } 72 73 /* resp->acl_{access,default} are released in nfs3svc_release_getacl. */ 74 RETURN_STATUS(0); 75 76 fail: 77 posix_acl_release(resp->acl_access); 78 posix_acl_release(resp->acl_default); 79 RETURN_STATUS(nfserr); 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 __be32 nfserr = 0; 92 int error; 93 94 fh = fh_copy(&resp->fh, &argp->fh); 95 nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR); 96 if (nfserr) 97 goto out; 98 99 inode = d_inode(fh->fh_dentry); 100 101 error = fh_want_write(fh); 102 if (error) 103 goto out_errno; 104 105 fh_lock(fh); 106 107 error = set_posix_acl(inode, ACL_TYPE_ACCESS, argp->acl_access); 108 if (error) 109 goto out_drop_lock; 110 error = set_posix_acl(inode, ACL_TYPE_DEFAULT, argp->acl_default); 111 112 out_drop_lock: 113 fh_unlock(fh); 114 fh_drop_write(fh); 115 out_errno: 116 nfserr = nfserrno(error); 117 out: 118 /* argp->acl_{access,default} may have been allocated in 119 nfs3svc_decode_setaclargs. */ 120 posix_acl_release(argp->acl_access); 121 posix_acl_release(argp->acl_default); 122 RETURN_STATUS(nfserr); 123 } 124 125 /* 126 * XDR decode functions 127 */ 128 static int nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p) 129 { 130 struct nfsd3_getaclargs *args = rqstp->rq_argp; 131 132 p = nfs3svc_decode_fh(p, &args->fh); 133 if (!p) 134 return 0; 135 args->mask = ntohl(*p); p++; 136 137 return xdr_argsize_check(rqstp, p); 138 } 139 140 141 static int nfs3svc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p) 142 { 143 struct nfsd3_setaclargs *args = rqstp->rq_argp; 144 struct kvec *head = rqstp->rq_arg.head; 145 unsigned int base; 146 int n; 147 148 p = nfs3svc_decode_fh(p, &args->fh); 149 if (!p) 150 return 0; 151 args->mask = ntohl(*p++); 152 if (args->mask & ~NFS_ACL_MASK || 153 !xdr_argsize_check(rqstp, p)) 154 return 0; 155 156 base = (char *)p - (char *)head->iov_base; 157 n = nfsacl_decode(&rqstp->rq_arg, base, NULL, 158 (args->mask & NFS_ACL) ? 159 &args->acl_access : NULL); 160 if (n > 0) 161 n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL, 162 (args->mask & NFS_DFACL) ? 163 &args->acl_default : NULL); 164 return (n > 0); 165 } 166 167 /* 168 * XDR encode functions 169 */ 170 171 /* GETACL */ 172 static int nfs3svc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p) 173 { 174 struct nfsd3_getaclres *resp = rqstp->rq_resp; 175 struct dentry *dentry = resp->fh.fh_dentry; 176 177 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 = nfs3svc_encode_post_op_attr(rqstp, p, &resp->fh); 222 223 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 #define nfs3svc_decode_voidargs NULL 239 #define nfs3svc_release_void NULL 240 #define nfsd3_setaclres nfsd3_attrstat 241 #define nfsd3_voidres nfsd3_voidargs 242 struct nfsd3_voidargs { int dummy; }; 243 244 #define PROC(name, argt, rest, relt, cache, respsize) \ 245 { \ 246 .pc_func = nfsd3_proc_##name, \ 247 .pc_decode = nfs3svc_decode_##argt##args, \ 248 .pc_encode = nfs3svc_encode_##rest##res, \ 249 .pc_release = nfs3svc_release_##relt, \ 250 .pc_argsize = sizeof(struct nfsd3_##argt##args), \ 251 .pc_ressize = sizeof(struct nfsd3_##rest##res), \ 252 .pc_cachetype = cache, \ 253 .pc_xdrressize = respsize, \ 254 } 255 256 #define ST 1 /* status*/ 257 #define AT 21 /* attributes */ 258 #define pAT (1+AT) /* post attributes - conditional */ 259 #define ACL (1+NFS_ACL_MAX_ENTRIES*3) /* Access Control List */ 260 261 static const struct svc_procedure nfsd_acl_procedures3[] = { 262 PROC(null, void, void, void, RC_NOCACHE, ST), 263 PROC(getacl, getacl, getacl, getacl, RC_NOCACHE, ST+1+2*(1+ACL)), 264 PROC(setacl, setacl, setacl, fhandle, RC_NOCACHE, ST+pAT), 265 }; 266 267 static unsigned int nfsd_acl_count3[ARRAY_SIZE(nfsd_acl_procedures3)]; 268 const struct svc_version nfsd_acl_version3 = { 269 .vs_vers = 3, 270 .vs_nproc = 3, 271 .vs_proc = nfsd_acl_procedures3, 272 .vs_count = nfsd_acl_count3, 273 .vs_dispatch = nfsd_dispatch, 274 .vs_xdrsize = NFS3_SVC_XDRSIZE, 275 }; 276 277