// SPDX-License-Identifier: GPL-2.0 /* * Process version 2 NFSACL requests. * * Copyright (C) 2002-2003 Andreas Gruenbacher <agruen@suse.de> */ #include "nfsd.h" /* FIXME: nfsacl.h is a broken header */ #include <linux/nfsacl.h> #include <linux/gfp.h> #include "cache.h" #include "xdr3.h" #include "vfs.h" #define NFSDDBG_FACILITY NFSDDBG_PROC /* * NULL call. */ static __be32 nfsacld_proc_null(struct svc_rqst *rqstp) { return rpc_success; } /* * Get the Access and/or Default ACL of a file. */ static __be32 nfsacld_proc_getacl(struct svc_rqst *rqstp) { struct nfsd3_getaclargs *argp = rqstp->rq_argp; struct nfsd3_getaclres *resp = rqstp->rq_resp; struct posix_acl *acl; struct inode *inode; svc_fh *fh; dprintk("nfsd: GETACL(2acl) %s\n", SVCFH_fmt(&argp->fh)); fh = fh_copy(&resp->fh, &argp->fh); resp->status = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP); if (resp->status != nfs_ok) goto out; inode = d_inode(fh->fh_dentry); if (argp->mask & ~NFS_ACL_MASK) { resp->status = nfserr_inval; goto out; } resp->mask = argp->mask; resp->status = fh_getattr(fh, &resp->stat); if (resp->status != nfs_ok) goto out; if (resp->mask & (NFS_ACL|NFS_ACLCNT)) { acl = get_inode_acl(inode, ACL_TYPE_ACCESS); if (acl == NULL) { /* Solaris returns the inode's minimum ACL. */ acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); } if (IS_ERR(acl)) { resp->status = nfserrno(PTR_ERR(acl)); goto fail; } resp->acl_access = acl; } if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) { /* Check how Solaris handles requests for the Default ACL of a non-directory! */ acl = get_inode_acl(inode, ACL_TYPE_DEFAULT); if (IS_ERR(acl)) { resp->status = nfserrno(PTR_ERR(acl)); goto fail; } resp->acl_default = acl; } /* resp->acl_{access,default} are released in nfssvc_release_getacl. */ out: return rpc_success; fail: posix_acl_release(resp->acl_access); posix_acl_release(resp->acl_default); goto out; } /* * Set the Access and/or Default ACL of a file. */ static __be32 nfsacld_proc_setacl(struct svc_rqst *rqstp) { struct nfsd3_setaclargs *argp = rqstp->rq_argp; struct nfsd_attrstat *resp = rqstp->rq_resp; struct inode *inode; svc_fh *fh; int error; dprintk("nfsd: SETACL(2acl) %s\n", SVCFH_fmt(&argp->fh)); fh = fh_copy(&resp->fh, &argp->fh); resp->status = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR); if (resp->status != nfs_ok) goto out; inode = d_inode(fh->fh_dentry); error = fh_want_write(fh); if (error) goto out_errno; inode_lock(inode); error = set_posix_acl(&init_user_ns, fh->fh_dentry, ACL_TYPE_ACCESS, argp->acl_access); if (error) goto out_drop_lock; error = set_posix_acl(&init_user_ns, fh->fh_dentry, ACL_TYPE_DEFAULT, argp->acl_default); if (error) goto out_drop_lock; inode_unlock(inode); fh_drop_write(fh); resp->status = fh_getattr(fh, &resp->stat); out: /* argp->acl_{access,default} may have been allocated in nfssvc_decode_setaclargs. */ posix_acl_release(argp->acl_access); posix_acl_release(argp->acl_default); return rpc_success; out_drop_lock: inode_unlock(inode); fh_drop_write(fh); out_errno: resp->status = nfserrno(error); goto out; } /* * Check file attributes */ static __be32 nfsacld_proc_getattr(struct svc_rqst *rqstp) { struct nfsd_fhandle *argp = rqstp->rq_argp; struct nfsd_attrstat *resp = rqstp->rq_resp; dprintk("nfsd: GETATTR %s\n", SVCFH_fmt(&argp->fh)); fh_copy(&resp->fh, &argp->fh); resp->status = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP); if (resp->status != nfs_ok) goto out; resp->status = fh_getattr(&resp->fh, &resp->stat); out: return rpc_success; } /* * Check file access */ static __be32 nfsacld_proc_access(struct svc_rqst *rqstp) { struct nfsd3_accessargs *argp = rqstp->rq_argp; struct nfsd3_accessres *resp = rqstp->rq_resp; dprintk("nfsd: ACCESS(2acl) %s 0x%x\n", SVCFH_fmt(&argp->fh), argp->access); fh_copy(&resp->fh, &argp->fh); resp->access = argp->access; resp->status = nfsd_access(rqstp, &resp->fh, &resp->access, NULL); if (resp->status != nfs_ok) goto out; resp->status = fh_getattr(&resp->fh, &resp->stat); out: return rpc_success; } /* * XDR decode functions */ static bool nfsaclsvc_decode_getaclargs(struct svc_rqst *rqstp, struct xdr_stream *xdr) { struct nfsd3_getaclargs *argp = rqstp->rq_argp; if (!svcxdr_decode_fhandle(xdr, &argp->fh)) return false; if (xdr_stream_decode_u32(xdr, &argp->mask) < 0) return false; return true; } static bool nfsaclsvc_decode_setaclargs(struct svc_rqst *rqstp, struct xdr_stream *xdr) { struct nfsd3_setaclargs *argp = rqstp->rq_argp; if (!svcxdr_decode_fhandle(xdr, &argp->fh)) return false; if (xdr_stream_decode_u32(xdr, &argp->mask) < 0) return false; if (argp->mask & ~NFS_ACL_MASK) return false; if (!nfs_stream_decode_acl(xdr, NULL, (argp->mask & NFS_ACL) ? &argp->acl_access : NULL)) return false; if (!nfs_stream_decode_acl(xdr, NULL, (argp->mask & NFS_DFACL) ? &argp->acl_default : NULL)) return false; return true; } static bool nfsaclsvc_decode_accessargs(struct svc_rqst *rqstp, struct xdr_stream *xdr) { struct nfsd3_accessargs *args = rqstp->rq_argp; if (!svcxdr_decode_fhandle(xdr, &args->fh)) return false; if (xdr_stream_decode_u32(xdr, &args->access) < 0) return false; return true; } /* * XDR encode functions */ /* GETACL */ static bool nfsaclsvc_encode_getaclres(struct svc_rqst *rqstp, struct xdr_stream *xdr) { struct nfsd3_getaclres *resp = rqstp->rq_resp; struct dentry *dentry = resp->fh.fh_dentry; struct inode *inode; if (!svcxdr_encode_stat(xdr, resp->status)) return false; if (dentry == NULL || d_really_is_negative(dentry)) return true; inode = d_inode(dentry); if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat)) return false; if (xdr_stream_encode_u32(xdr, resp->mask) < 0) return false; if (!nfs_stream_encode_acl(xdr, inode, resp->acl_access, resp->mask & NFS_ACL, 0)) return false; if (!nfs_stream_encode_acl(xdr, inode, resp->acl_default, resp->mask & NFS_DFACL, NFS_ACL_DEFAULT)) return false; return true; } /* ACCESS */ static bool nfsaclsvc_encode_accessres(struct svc_rqst *rqstp, struct xdr_stream *xdr) { struct nfsd3_accessres *resp = rqstp->rq_resp; if (!svcxdr_encode_stat(xdr, resp->status)) return false; switch (resp->status) { case nfs_ok: if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat)) return false; if (xdr_stream_encode_u32(xdr, resp->access) < 0) return false; break; } return true; } /* * XDR release functions */ static void nfsaclsvc_release_getacl(struct svc_rqst *rqstp) { struct nfsd3_getaclres *resp = rqstp->rq_resp; fh_put(&resp->fh); posix_acl_release(resp->acl_access); posix_acl_release(resp->acl_default); } static void nfsaclsvc_release_access(struct svc_rqst *rqstp) { struct nfsd3_accessres *resp = rqstp->rq_resp; fh_put(&resp->fh); } struct nfsd3_voidargs { int dummy; }; #define ST 1 /* status*/ #define AT 21 /* attributes */ #define pAT (1+AT) /* post attributes - conditional */ #define ACL (1+NFS_ACL_MAX_ENTRIES*3) /* Access Control List */ static const struct svc_procedure nfsd_acl_procedures2[5] = { [ACLPROC2_NULL] = { .pc_func = nfsacld_proc_null, .pc_decode = nfssvc_decode_voidarg, .pc_encode = nfssvc_encode_voidres, .pc_argsize = sizeof(struct nfsd_voidargs), .pc_argzero = sizeof(struct nfsd_voidargs), .pc_ressize = sizeof(struct nfsd_voidres), .pc_cachetype = RC_NOCACHE, .pc_xdrressize = ST, .pc_name = "NULL", }, [ACLPROC2_GETACL] = { .pc_func = nfsacld_proc_getacl, .pc_decode = nfsaclsvc_decode_getaclargs, .pc_encode = nfsaclsvc_encode_getaclres, .pc_release = nfsaclsvc_release_getacl, .pc_argsize = sizeof(struct nfsd3_getaclargs), .pc_argzero = sizeof(struct nfsd3_getaclargs), .pc_ressize = sizeof(struct nfsd3_getaclres), .pc_cachetype = RC_NOCACHE, .pc_xdrressize = ST+1+2*(1+ACL), .pc_name = "GETACL", }, [ACLPROC2_SETACL] = { .pc_func = nfsacld_proc_setacl, .pc_decode = nfsaclsvc_decode_setaclargs, .pc_encode = nfssvc_encode_attrstatres, .pc_release = nfssvc_release_attrstat, .pc_argsize = sizeof(struct nfsd3_setaclargs), .pc_argzero = sizeof(struct nfsd3_setaclargs), .pc_ressize = sizeof(struct nfsd_attrstat), .pc_cachetype = RC_NOCACHE, .pc_xdrressize = ST+AT, .pc_name = "SETACL", }, [ACLPROC2_GETATTR] = { .pc_func = nfsacld_proc_getattr, .pc_decode = nfssvc_decode_fhandleargs, .pc_encode = nfssvc_encode_attrstatres, .pc_release = nfssvc_release_attrstat, .pc_argsize = sizeof(struct nfsd_fhandle), .pc_argzero = sizeof(struct nfsd_fhandle), .pc_ressize = sizeof(struct nfsd_attrstat), .pc_cachetype = RC_NOCACHE, .pc_xdrressize = ST+AT, .pc_name = "GETATTR", }, [ACLPROC2_ACCESS] = { .pc_func = nfsacld_proc_access, .pc_decode = nfsaclsvc_decode_accessargs, .pc_encode = nfsaclsvc_encode_accessres, .pc_release = nfsaclsvc_release_access, .pc_argsize = sizeof(struct nfsd3_accessargs), .pc_argzero = sizeof(struct nfsd3_accessargs), .pc_ressize = sizeof(struct nfsd3_accessres), .pc_cachetype = RC_NOCACHE, .pc_xdrressize = ST+AT+1, .pc_name = "SETATTR", }, }; static unsigned int nfsd_acl_count2[ARRAY_SIZE(nfsd_acl_procedures2)]; const struct svc_version nfsd_acl_version2 = { .vs_vers = 2, .vs_nproc = 5, .vs_proc = nfsd_acl_procedures2, .vs_count = nfsd_acl_count2, .vs_dispatch = nfsd_dispatch, .vs_xdrsize = NFS3_SVC_XDRSIZE, };