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_inode_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_inode_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 resp->acl_access = NULL; 80 resp->acl_default = NULL; 81 goto out; 82 } 83 84 /* 85 * Set the Access and/or Default ACL of a file. 86 */ 87 static __be32 nfsd3_proc_setacl(struct svc_rqst *rqstp) 88 { 89 struct nfsd3_setaclargs *argp = rqstp->rq_argp; 90 struct nfsd3_attrstat *resp = rqstp->rq_resp; 91 struct inode *inode; 92 svc_fh *fh; 93 int error; 94 95 fh = fh_copy(&resp->fh, &argp->fh); 96 resp->status = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR); 97 if (resp->status != nfs_ok) 98 goto out; 99 100 inode = d_inode(fh->fh_dentry); 101 102 error = fh_want_write(fh); 103 if (error) 104 goto out_errno; 105 106 inode_lock(inode); 107 108 error = set_posix_acl(&nop_mnt_idmap, fh->fh_dentry, ACL_TYPE_ACCESS, 109 argp->acl_access); 110 if (error) 111 goto out_drop_lock; 112 error = set_posix_acl(&nop_mnt_idmap, fh->fh_dentry, ACL_TYPE_DEFAULT, 113 argp->acl_default); 114 115 out_drop_lock: 116 inode_unlock(inode); 117 fh_drop_write(fh); 118 out_errno: 119 resp->status = nfserrno(error); 120 out: 121 /* argp->acl_{access,default} are released in nfs3svc_release_setacl. */ 122 return rpc_success; 123 } 124 125 /* 126 * XDR decode functions 127 */ 128 129 static bool 130 nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, struct xdr_stream *xdr) 131 { 132 struct nfsd3_getaclargs *args = rqstp->rq_argp; 133 134 if (!svcxdr_decode_nfs_fh3(xdr, &args->fh)) 135 return false; 136 if (xdr_stream_decode_u32(xdr, &args->mask) < 0) 137 return false; 138 139 return true; 140 } 141 142 static bool 143 nfs3svc_decode_setaclargs(struct svc_rqst *rqstp, struct xdr_stream *xdr) 144 { 145 struct nfsd3_setaclargs *argp = rqstp->rq_argp; 146 147 if (!svcxdr_decode_nfs_fh3(xdr, &argp->fh)) 148 return false; 149 if (xdr_stream_decode_u32(xdr, &argp->mask) < 0) 150 return false; 151 if (argp->mask & ~NFS_ACL_MASK) 152 return false; 153 if (!nfs_stream_decode_acl(xdr, NULL, (argp->mask & NFS_ACL) ? 154 &argp->acl_access : NULL)) 155 return false; 156 if (!nfs_stream_decode_acl(xdr, NULL, (argp->mask & NFS_DFACL) ? 157 &argp->acl_default : NULL)) 158 return false; 159 160 return true; 161 } 162 163 /* 164 * XDR encode functions 165 */ 166 167 /* GETACL */ 168 static bool 169 nfs3svc_encode_getaclres(struct svc_rqst *rqstp, struct xdr_stream *xdr) 170 { 171 struct nfsd3_getaclres *resp = rqstp->rq_resp; 172 struct dentry *dentry = resp->fh.fh_dentry; 173 struct inode *inode; 174 175 if (!svcxdr_encode_nfsstat3(xdr, resp->status)) 176 return false; 177 switch (resp->status) { 178 case nfs_ok: 179 inode = d_inode(dentry); 180 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh)) 181 return false; 182 if (xdr_stream_encode_u32(xdr, resp->mask) < 0) 183 return false; 184 185 if (!nfs_stream_encode_acl(xdr, inode, resp->acl_access, 186 resp->mask & NFS_ACL, 0)) 187 return false; 188 if (!nfs_stream_encode_acl(xdr, inode, resp->acl_default, 189 resp->mask & NFS_DFACL, 190 NFS_ACL_DEFAULT)) 191 return false; 192 break; 193 default: 194 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh)) 195 return false; 196 } 197 198 return true; 199 } 200 201 /* SETACL */ 202 static bool 203 nfs3svc_encode_setaclres(struct svc_rqst *rqstp, struct xdr_stream *xdr) 204 { 205 struct nfsd3_attrstat *resp = rqstp->rq_resp; 206 207 return svcxdr_encode_nfsstat3(xdr, resp->status) && 208 svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh); 209 } 210 211 /* 212 * XDR release functions 213 */ 214 static void nfs3svc_release_getacl(struct svc_rqst *rqstp) 215 { 216 struct nfsd3_getaclres *resp = rqstp->rq_resp; 217 218 fh_put(&resp->fh); 219 posix_acl_release(resp->acl_access); 220 posix_acl_release(resp->acl_default); 221 } 222 223 static void nfs3svc_release_setacl(struct svc_rqst *rqstp) 224 { 225 struct nfsd3_setaclargs *argp = rqstp->rq_argp; 226 struct nfsd3_attrstat *resp = rqstp->rq_resp; 227 228 fh_put(&resp->fh); 229 posix_acl_release(argp->acl_access); 230 posix_acl_release(argp->acl_default); 231 } 232 233 #define ST 1 /* status*/ 234 #define AT 21 /* attributes */ 235 #define pAT (1+AT) /* post attributes - conditional */ 236 #define ACL (1+NFS_ACL_MAX_ENTRIES*3) /* Access Control List */ 237 238 static const struct svc_procedure nfsd_acl_procedures3[3] = { 239 [ACLPROC3_NULL] = { 240 .pc_func = nfsd3_proc_null, 241 .pc_decode = nfssvc_decode_voidarg, 242 .pc_encode = nfssvc_encode_voidres, 243 .pc_argsize = sizeof(struct nfsd_voidargs), 244 .pc_argzero = sizeof(struct nfsd_voidargs), 245 .pc_ressize = sizeof(struct nfsd_voidres), 246 .pc_cachetype = RC_NOCACHE, 247 .pc_xdrressize = ST, 248 .pc_name = "NULL", 249 }, 250 [ACLPROC3_GETACL] = { 251 .pc_func = nfsd3_proc_getacl, 252 .pc_decode = nfs3svc_decode_getaclargs, 253 .pc_encode = nfs3svc_encode_getaclres, 254 .pc_release = nfs3svc_release_getacl, 255 .pc_argsize = sizeof(struct nfsd3_getaclargs), 256 .pc_argzero = sizeof(struct nfsd3_getaclargs), 257 .pc_ressize = sizeof(struct nfsd3_getaclres), 258 .pc_cachetype = RC_NOCACHE, 259 .pc_xdrressize = ST+1+2*(1+ACL), 260 .pc_name = "GETACL", 261 }, 262 [ACLPROC3_SETACL] = { 263 .pc_func = nfsd3_proc_setacl, 264 .pc_decode = nfs3svc_decode_setaclargs, 265 .pc_encode = nfs3svc_encode_setaclres, 266 .pc_release = nfs3svc_release_setacl, 267 .pc_argsize = sizeof(struct nfsd3_setaclargs), 268 .pc_argzero = sizeof(struct nfsd3_setaclargs), 269 .pc_ressize = sizeof(struct nfsd3_attrstat), 270 .pc_cachetype = RC_NOCACHE, 271 .pc_xdrressize = ST+pAT, 272 .pc_name = "SETACL", 273 }, 274 }; 275 276 static DEFINE_PER_CPU_ALIGNED(unsigned long, 277 nfsd_acl_count3[ARRAY_SIZE(nfsd_acl_procedures3)]); 278 const struct svc_version nfsd_acl_version3 = { 279 .vs_vers = 3, 280 .vs_nproc = ARRAY_SIZE(nfsd_acl_procedures3), 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