/* * Perform sanity checks on the dentry in a client's file handle. * * Note that the file handle dentry may need to be freed even after * an error return. * * This is only called at the start of an nfsproc call, so fhp points to * a svc_fh which is all 0 except for the over-the-wire file handle. */ __be32 fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, int access) { struct knfsd_fh *fh = &fhp->fh_handle; struct svc_export *exp = NULL; struct dentry *dentry; __be32 error = 0; dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp)); if (!fhp->fh_dentry) { __u32 *datap=NULL; __u32 tfh[3]; /* filehandle fragment for oldstyle filehandles */ int fileid_type; int data_left = fh->fh_size/4; error = nfserr_stale; if (rqstp->rq_client == NULL) goto out; if (rqstp->rq_vers > 2) error = nfserr_badhandle; if (rqstp->rq_vers == 4 && fh->fh_size == 0) return nfserr_nofilehandle; if (fh->fh_version == 1) { int len; datap = fh->fh_auth; if (--data_left<0) goto out; switch (fh->fh_auth_type) { case 0: break; default: goto out; } len = key_len(fh->fh_fsid_type) / 4; if (len == 0) goto out; if (fh->fh_fsid_type == FSID_MAJOR_MINOR) { /* deprecated, convert to type 3 */ len = key_len(FSID_ENCODE_DEV)/4; fh->fh_fsid_type = FSID_ENCODE_DEV; fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl(fh->fh_fsid[0]), ntohl(fh->fh_fsid[1]))); fh->fh_fsid[1] = fh->fh_fsid[2]; } if ((data_left -= len)<0) goto out; exp = exp_find(rqstp->rq_client, fh->fh_fsid_type, datap, &rqstp->rq_chandle); datap += len; } else { dev_t xdev; ino_t xino; if (fh->fh_size != NFS_FHSIZE) goto out; /* assume old filehandle format */ xdev = old_decode_dev(fh->ofh_xdev); xino = u32_to_ino_t(fh->ofh_xino); mk_fsid(FSID_DEV, tfh, xdev, xino, 0, NULL); exp = exp_find(rqstp->rq_client, FSID_DEV, tfh, &rqstp->rq_chandle); } if (IS_ERR(exp) && (PTR_ERR(exp) == -EAGAIN || PTR_ERR(exp) == -ETIMEDOUT)) { error = nfserrno(PTR_ERR(exp)); goto out; } error = nfserr_stale; if (!exp || IS_ERR(exp)) goto out; /* Check if the request originated from a secure port. */ error = nfserr_perm; if (!rqstp->rq_secure && EX_SECURE(exp)) { char buf[RPC_MAX_ADDRBUFLEN]; printk(KERN_WARNING "nfsd: request from insecure port %s!\n", svc_print_addr(rqstp, buf, sizeof(buf))); goto out; } /* Set user creds for this exportpoint */ error = nfserrno(nfsd_setuser(rqstp, exp)); if (error) goto out; /* * Look up the dentry using the NFS file handle. */ error = nfserr_stale; if (rqstp->rq_vers > 2) error = nfserr_badhandle; if (fh->fh_version != 1) { tfh[0] = fh->ofh_ino; tfh[1] = fh->ofh_generation; tfh[2] = fh->ofh_dirino; datap = tfh; data_left = 3; if (fh->ofh_dirino == 0) fileid_type = 1; else fileid_type = 2; } else fileid_type = fh->fh_fileid_type; if (fileid_type == 0) dentry = dget(exp->ex_dentry); else { struct export_operations *nop = exp->ex_mnt->mnt_sb->s_export_op; dentry = CALL(nop,decode_fh)(exp->ex_mnt->mnt_sb, datap, data_left, fileid_type, nfsd_acceptable, exp); } if (dentry == NULL) goto out; if (IS_ERR(dentry)) { if (PTR_ERR(dentry) != -EINVAL) error = nfserrno(PTR_ERR(dentry)); goto out; } if (S_ISDIR(dentry->d_inode->i_mode) && (dentry->d_flags & DCACHE_DISCONNECTED)) { printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %s/%s\n", dentry->d_parent->d_name.name, dentry->d_name.name); } fhp->fh_dentry = dentry; fhp->fh_export = exp; nfsd_nr_verified++; } else { /* just rechecking permissions * (e.g. nfsproc_create calls fh_verify, then nfsd_create does as well) */ dprintk("nfsd: fh_verify - just checking\n"); dentry = fhp->fh_dentry; exp = fhp->fh_export; /* Set user creds for this exportpoint; necessary even * in the "just checking" case because this may be a * filehandle that was created by fh_compose, and that * is about to be used in another nfsv4 compound * operation */ error = nfserrno(nfsd_setuser(rqstp, exp)); if (error) goto out; } cache_get(&exp->h); error = nfsd_mode_check(rqstp, dentry->d_inode->i_mode, type); if (error) goto out; /* Finally, check access permissions. */ error = nfsd_permission(exp, dentry, access); if (error) { dprintk("fh_verify: %s/%s permission failure, " "acc=%x, error=%d\n", dentry->d_parent->d_name.name, dentry->d_name.name, access, ntohl(error)); } out: if (exp && !IS_ERR(exp)) exp_put(exp); if (error == nfserr_stale) nfsdstats.fh_stale++; return error; }
/* * Perform sanity checks on the dentry in a client's file handle. * * Note that the file handle dentry may need to be freed even after * an error return. * * This is only called at the start of an nfsproc call, so fhp points to * a svc_fh which is all 0 except for the over-the-wire file handle. */ u32 fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, int access) { struct knfsd_fh *fh = &fhp->fh_handle; struct svc_export *exp = NULL; struct dentry *dentry; struct inode *inode; u32 error = 0; dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp)); /* keep this filehandle for possible reference when encoding attributes */ rqstp->rq_reffh = fh; if (!fhp->fh_dentry) { __u32 *datap=NULL; __u32 tfh[3]; /* filehandle fragment for oldstyle filehandles */ int fileid_type; int data_left = fh->fh_size/4; error = nfserr_stale; if (rqstp->rq_client == NULL) goto out; if (rqstp->rq_vers > 2) error = nfserr_badhandle; if (rqstp->rq_vers == 4 && fh->fh_size == 0) return nfserr_nofilehandle; if (fh->fh_version == 1) { int len; datap = fh->fh_auth; if (--data_left<0) goto out; switch (fh->fh_auth_type) { case 0: break; default: goto out; } len = key_len(fh->fh_fsid_type) / 4; if (len == 0) goto out; if (fh->fh_fsid_type == 2) { /* deprecated, convert to type 3 */ len = 3; fh->fh_fsid_type = 3; fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl(fh->fh_fsid[0]), ntohl(fh->fh_fsid[1]))); fh->fh_fsid[1] = fh->fh_fsid[2]; } if ((data_left -= len)<0) goto out; exp = exp_find(rqstp->rq_client, fh->fh_fsid_type, datap, &rqstp->rq_chandle); datap += len; } else { dev_t xdev; ino_t xino; if (fh->fh_size != NFS_FHSIZE) goto out; /* assume old filehandle format */ xdev = old_decode_dev(fh->ofh_xdev); xino = u32_to_ino_t(fh->ofh_xino); mk_fsid_v0(tfh, xdev, xino); exp = exp_find(rqstp->rq_client, 0, tfh, &rqstp->rq_chandle); } error = nfserr_dropit; if (IS_ERR(exp) && PTR_ERR(exp) == -EAGAIN) goto out; error = nfserr_stale; if (!exp || IS_ERR(exp)) goto out; /* Check if the request originated from a secure port. */ error = nfserr_perm; if (!rqstp->rq_secure && EX_SECURE(exp)) { printk(KERN_WARNING "nfsd: request from insecure port (%08x:%d)!\n", ntohl(rqstp->rq_addr.sin_addr.s_addr), ntohs(rqstp->rq_addr.sin_port)); goto out; } /* Set user creds for this exportpoint */ error = nfsd_setuser(rqstp, exp); if (error) { error = nfserrno(error); goto out; } /* * Look up the dentry using the NFS file handle. */ error = nfserr_stale; if (rqstp->rq_vers > 2) error = nfserr_badhandle; if (fh->fh_version != 1) { tfh[0] = fh->ofh_ino; tfh[1] = fh->ofh_generation; tfh[2] = fh->ofh_dirino; datap = tfh; data_left = 3; if (fh->ofh_dirino == 0) fileid_type = 1; else fileid_type = 2; } else fileid_type = fh->fh_fileid_type; if (fileid_type == 0) dentry = dget(exp->ex_dentry); else { struct export_operations *nop = exp->ex_mnt->mnt_sb->s_export_op; dentry = CALL(nop,decode_fh)(exp->ex_mnt->mnt_sb, datap, data_left, fileid_type, nfsd_acceptable, exp); } if (dentry == NULL) goto out; if (IS_ERR(dentry)) { if (PTR_ERR(dentry) != -EINVAL) error = nfserrno(PTR_ERR(dentry)); goto out; } #ifdef NFSD_PARANOIA if (S_ISDIR(dentry->d_inode->i_mode) && (dentry->d_flags & DCACHE_DISCONNECTED)) { printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %s/%s\n", dentry->d_parent->d_name.name, dentry->d_name.name); } #endif fhp->fh_dentry = dentry; fhp->fh_export = exp; nfsd_nr_verified++; } else { /* just rechecking permissions * (e.g. nfsproc_create calls fh_verify, then nfsd_create does as well) */ dprintk("nfsd: fh_verify - just checking\n"); dentry = fhp->fh_dentry; exp = fhp->fh_export; } cache_get(&exp->h); inode = dentry->d_inode; /* Type check. The correct error return for type mismatches * does not seem to be generally agreed upon. SunOS seems to * use EISDIR if file isn't S_IFREG; a comment in the NFSv3 * spec says this is incorrect (implementation notes for the * write call). */ /* Type can be negative when creating hardlinks - not to a dir */ if (type > 0 && (inode->i_mode & S_IFMT) != type) { if (rqstp->rq_vers == 4 && (inode->i_mode & S_IFMT) == S_IFLNK) error = nfserr_symlink; else if (type == S_IFDIR) error = nfserr_notdir; else if ((inode->i_mode & S_IFMT) == S_IFDIR) error = nfserr_isdir; else error = nfserr_inval; goto out; } if (type < 0 && (inode->i_mode & S_IFMT) == -type) { if (rqstp->rq_vers == 4 && (inode->i_mode & S_IFMT) == S_IFLNK) error = nfserr_symlink; else if (type == -S_IFDIR) error = nfserr_isdir; else error = nfserr_notdir; goto out; } /* Finally, check access permissions. */ error = nfsd_permission(exp, dentry, access); #ifdef NFSD_PARANOIA_EXTREME if (error) { printk("fh_verify: %s/%s permission failure, acc=%x, error=%d\n", dentry->d_parent->d_name.name, dentry->d_name.name, access, (error >> 24)); } #endif out: if (exp && !IS_ERR(exp)) exp_put(exp); if (error == nfserr_stale) nfsdstats.fh_stale++; return error; }