// 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 #define RETURN_STATUS(st) { resp->status = (st); return (st); } /* * NULL call. */ static __be32 nfsacld_proc_null(struct svc_rqst *rqstp) { return nfs_ok; } /* * 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; __be32 nfserr = 0; dprintk("nfsd: GETACL(2acl) %s\n", SVCFH_fmt(&argp->fh)); fh = fh_copy(&resp->fh, &argp->fh); nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP); if (nfserr) RETURN_STATUS(nfserr); inode = d_inode(fh->fh_dentry); if (argp->mask & ~NFS_ACL_MASK) RETURN_STATUS(nfserr_inval); resp->mask = argp->mask; nfserr = fh_getattr(fh, &resp->stat); if (nfserr) RETURN_STATUS(nfserr); if (resp->mask & (NFS_ACL|NFS_ACLCNT)) { acl = get_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)) { nfserr = 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_acl(inode, ACL_TYPE_DEFAULT); if (IS_ERR(acl)) { nfserr = nfserrno(PTR_ERR(acl)); goto fail; } resp->acl_default = acl; } /* resp->acl_{access,default} are released in nfssvc_release_getacl. */ RETURN_STATUS(0); fail: posix_acl_release(resp->acl_access); posix_acl_release(resp->acl_default); RETURN_STATUS(nfserr); } /* * 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; __be32 nfserr = 0; int error; dprintk("nfsd: SETACL(2acl) %s\n", SVCFH_fmt(&argp->fh)); fh = fh_copy(&resp->fh, &argp->fh); nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR); if (nfserr) goto out; inode = d_inode(fh->fh_dentry); error = fh_want_write(fh); if (error) goto out_errno; fh_lock(fh); error = set_posix_acl(inode, ACL_TYPE_ACCESS, argp->acl_access); if (error) goto out_drop_lock; error = set_posix_acl(inode, ACL_TYPE_DEFAULT, argp->acl_default); if (error) goto out_drop_lock; fh_unlock(fh); fh_drop_write(fh); nfserr = 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 nfserr; out_drop_lock: fh_unlock(fh); fh_drop_write(fh); out_errno: nfserr = 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; __be32 nfserr; dprintk("nfsd: GETATTR %s\n", SVCFH_fmt(&argp->fh)); fh_copy(&resp->fh, &argp->fh); nfserr = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_NOP); if (nfserr) return nfserr; nfserr = fh_getattr(&resp->fh, &resp->stat); return nfserr; } /* * 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; __be32 nfserr; dprintk("nfsd: ACCESS(2acl) %s 0x%x\n", SVCFH_fmt(&argp->fh), argp->access); fh_copy(&resp->fh, &argp->fh); resp->access = argp->access; nfserr = nfsd_access(rqstp, &resp->fh, &resp->access, NULL); if (nfserr) return nfserr; nfserr = fh_getattr(&resp->fh, &resp->stat); return nfserr; } /* * XDR decode functions */ static int nfsaclsvc_decode_getaclargs(struct svc_rqst *rqstp, __be32 *p) { struct nfsd3_getaclargs *argp = rqstp->rq_argp; p = nfs2svc_decode_fh(p, &argp->fh); if (!p) return 0; argp->mask = ntohl(*p); p++; return xdr_argsize_check(rqstp, p); } static int nfsaclsvc_decode_setaclargs(struct svc_rqst *rqstp, __be32 *p) { struct nfsd3_setaclargs *argp = rqstp->rq_argp; struct kvec *head = rqstp->rq_arg.head; unsigned int base; int n; p = nfs2svc_decode_fh(p, &argp->fh); if (!p) return 0; argp->mask = ntohl(*p++); if (argp->mask & ~NFS_ACL_MASK || !xdr_argsize_check(rqstp, p)) return 0; base = (char *)p - (char *)head->iov_base; n = nfsacl_decode(&rqstp->rq_arg, base, NULL, (argp->mask & NFS_ACL) ? &argp->acl_access : NULL); if (n > 0) n = nfsacl_decode(&rqstp->rq_arg, base + n, NULL, (argp->mask & NFS_DFACL) ? &argp->acl_default : NULL); return (n > 0); } static int nfsaclsvc_decode_fhandleargs(struct svc_rqst *rqstp, __be32 *p) { struct nfsd_fhandle *argp = rqstp->rq_argp; p = nfs2svc_decode_fh(p, &argp->fh); if (!p) return 0; return xdr_argsize_check(rqstp, p); } static int nfsaclsvc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p) { struct nfsd3_accessargs *argp = rqstp->rq_argp; p = nfs2svc_decode_fh(p, &argp->fh); if (!p) return 0; argp->access = ntohl(*p++); return xdr_argsize_check(rqstp, p); } /* * XDR encode functions */ /* * There must be an encoding function for void results so svc_process * will work properly. */ static int nfsaclsvc_encode_voidres(struct svc_rqst *rqstp, __be32 *p) { return xdr_ressize_check(rqstp, p); } /* GETACL */ static int nfsaclsvc_encode_getaclres(struct svc_rqst *rqstp, __be32 *p) { struct nfsd3_getaclres *resp = rqstp->rq_resp; struct dentry *dentry = resp->fh.fh_dentry; struct inode *inode; struct kvec *head = rqstp->rq_res.head; unsigned int base; int n; int w; /* * Since this is version 2, the check for nfserr in * nfsd_dispatch actually ensures the following cannot happen. * However, it seems fragile to depend on that. */ if (dentry == NULL || d_really_is_negative(dentry)) return 0; inode = d_inode(dentry); p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat); *p++ = htonl(resp->mask); if (!xdr_ressize_check(rqstp, p)) return 0; base = (char *)p - (char *)head->iov_base; rqstp->rq_res.page_len = w = nfsacl_size( (resp->mask & NFS_ACL) ? resp->acl_access : NULL, (resp->mask & NFS_DFACL) ? resp->acl_default : NULL); while (w > 0) { if (!*(rqstp->rq_next_page++)) return 0; w -= PAGE_SIZE; } n = nfsacl_encode(&rqstp->rq_res, base, inode, resp->acl_access, resp->mask & NFS_ACL, 0); if (n > 0) n = nfsacl_encode(&rqstp->rq_res, base + n, inode, resp->acl_default, resp->mask & NFS_DFACL, NFS_ACL_DEFAULT); return (n > 0); } static int nfsaclsvc_encode_attrstatres(struct svc_rqst *rqstp, __be32 *p) { struct nfsd_attrstat *resp = rqstp->rq_resp; p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat); return xdr_ressize_check(rqstp, p); } /* ACCESS */ static int nfsaclsvc_encode_accessres(struct svc_rqst *rqstp, __be32 *p) { struct nfsd3_accessres *resp = rqstp->rq_resp; p = nfs2svc_encode_fattr(rqstp, p, &resp->fh, &resp->stat); *p++ = htonl(resp->access); return xdr_ressize_check(rqstp, p); } /* * 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_attrstat(struct svc_rqst *rqstp) { struct nfsd_attrstat *resp = rqstp->rq_resp; fh_put(&resp->fh); } static void nfsaclsvc_release_access(struct svc_rqst *rqstp) { struct nfsd3_accessres *resp = rqstp->rq_resp; fh_put(&resp->fh); } #define nfsaclsvc_decode_voidargs NULL #define nfsaclsvc_release_void NULL #define nfsd3_fhandleargs nfsd_fhandle #define nfsd3_attrstatres nfsd_attrstat #define nfsd3_voidres nfsd3_voidargs struct nfsd3_voidargs { int dummy; }; #define PROC(name, argt, rest, relt, cache, respsize) \ { \ .pc_func = nfsacld_proc_##name, \ .pc_decode = nfsaclsvc_decode_##argt##args, \ .pc_encode = nfsaclsvc_encode_##rest##res, \ .pc_release = nfsaclsvc_release_##relt, \ .pc_argsize = sizeof(struct nfsd3_##argt##args), \ .pc_ressize = sizeof(struct nfsd3_##rest##res), \ .pc_cachetype = cache, \ .pc_xdrressize = respsize, \ } #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[] = { PROC(null, void, void, void, RC_NOCACHE, ST), PROC(getacl, getacl, getacl, getacl, RC_NOCACHE, ST+1+2*(1+ACL)), PROC(setacl, setacl, attrstat, attrstat, RC_NOCACHE, ST+AT), PROC(getattr, fhandle, attrstat, attrstat, RC_NOCACHE, ST+AT), PROC(access, access, access, access, RC_NOCACHE, ST+AT+1), }; 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, };