fs/nfsd/nfs3acl.c

   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         goto out;
  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         int error;
  92
  93         fh = fh_copy(&resp->fh, &argp->fh);
  94         resp->status = fh_verify(rqstp, &resp->fh, 0, NFSD_MAY_SATTR);
  95         if (resp->status != nfs_ok)
  96                 goto out;
  97
  98         inode = d_inode(fh->fh_dentry);
  99
 100         error = fh_want_write(fh);
 101         if (error)
 102                 goto out_errno;
 103
 104         inode_lock(inode);
 105
 106         error = set_posix_acl(&nop_mnt_idmap, fh->fh_dentry, ACL_TYPE_ACCESS,
 107                               argp->acl_access);
 108         if (error)
 109                 goto out_drop_lock;
 110         error = set_posix_acl(&nop_mnt_idmap, fh->fh_dentry, ACL_TYPE_DEFAULT,
 111                               argp->acl_default);
 112
 113 out_drop_lock:
 114         inode_unlock(inode);
 115         fh_drop_write(fh);
 116 out_errno:
 117         resp->status = nfserrno(error);
 118 out:
 119         /* argp->acl_{access,default} may have been allocated in
 120            nfs3svc_decode_setaclargs. */
 121         posix_acl_release(argp->acl_access);
 122         posix_acl_release(argp->acl_default);
 123         return rpc_success;
 124 }
 125
 126 /*
 127  * XDR decode functions
 128  */
 129
 130 static bool
 131 nfs3svc_decode_getaclargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 132 {
 133         struct nfsd3_getaclargs *args = rqstp->rq_argp;
 134
 135         if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
 136                 return false;
 137         if (xdr_stream_decode_u32(xdr, &args->mask) < 0)
 138                 return false;
 139
 140         return true;
 141 }
 142
 143 static bool
 144 nfs3svc_decode_setaclargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 145 {
 146         struct nfsd3_setaclargs *argp = rqstp->rq_argp;
 147
 148         if (!svcxdr_decode_nfs_fh3(xdr, &argp->fh))
 149                 return false;
 150         if (xdr_stream_decode_u32(xdr, &argp->mask) < 0)
 151                 return false;
 152         if (argp->mask & ~NFS_ACL_MASK)
 153                 return false;
 154         if (!nfs_stream_decode_acl(xdr, NULL, (argp->mask & NFS_ACL) ?
 155                                    &argp->acl_access : NULL))
 156                 return false;
 157         if (!nfs_stream_decode_acl(xdr, NULL, (argp->mask & NFS_DFACL) ?
 158                                    &argp->acl_default : NULL))
 159                 return false;
 160
 161         return true;
 162 }
 163
 164 /*
 165  * XDR encode functions
 166  */
 167
 168 /* GETACL */
 169 static bool
 170 nfs3svc_encode_getaclres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 171 {
 172         struct nfsd3_getaclres *resp = rqstp->rq_resp;
 173         struct dentry *dentry = resp->fh.fh_dentry;
 174         struct inode *inode;
 175
 176         if (!svcxdr_encode_nfsstat3(xdr, resp->status))
 177                 return false;
 178         switch (resp->status) {
 179         case nfs_ok:
 180                 inode = d_inode(dentry);
 181                 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
 182                         return false;
 183                 if (xdr_stream_encode_u32(xdr, resp->mask) < 0)
 184                         return false;
 185
 186                 if (!nfs_stream_encode_acl(xdr, inode, resp->acl_access,
 187                                            resp->mask & NFS_ACL, 0))
 188                         return false;
 189                 if (!nfs_stream_encode_acl(xdr, inode, resp->acl_default,
 190                                            resp->mask & NFS_DFACL,
 191                                            NFS_ACL_DEFAULT))
 192                         return false;
 193                 break;
 194         default:
 195                 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
 196                         return false;
 197         }
 198
 199         return true;
 200 }
 201
 202 /* SETACL */
 203 static bool
 204 nfs3svc_encode_setaclres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 205 {
 206         struct nfsd3_attrstat *resp = rqstp->rq_resp;
 207
 208         return svcxdr_encode_nfsstat3(xdr, resp->status) &&
 209                 svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh);
 210 }
 211
 212 /*
 213  * XDR release functions
 214  */
 215 static void nfs3svc_release_getacl(struct svc_rqst *rqstp)
 216 {
 217         struct nfsd3_getaclres *resp = rqstp->rq_resp;
 218
 219         fh_put(&resp->fh);
 220         posix_acl_release(resp->acl_access);
 221         posix_acl_release(resp->acl_default);
 222 }
 223
 224 #define ST 1            /* status*/
 225 #define AT 21           /* attributes */
 226 #define pAT (1+AT)      /* post attributes - conditional */
 227 #define ACL (1+NFS_ACL_MAX_ENTRIES*3)  /* Access Control List */
 228
 229 static const struct svc_procedure nfsd_acl_procedures3[3] = {
 230         [ACLPROC3_NULL] = {
 231                 .pc_func = nfsd3_proc_null,
 232                 .pc_decode = nfssvc_decode_voidarg,
 233                 .pc_encode = nfssvc_encode_voidres,
 234                 .pc_argsize = sizeof(struct nfsd_voidargs),
 235                 .pc_argzero = sizeof(struct nfsd_voidargs),
 236                 .pc_ressize = sizeof(struct nfsd_voidres),
 237                 .pc_cachetype = RC_NOCACHE,
 238                 .pc_xdrressize = ST,
 239                 .pc_name = "NULL",
 240         },
 241         [ACLPROC3_GETACL] = {
 242                 .pc_func = nfsd3_proc_getacl,
 243                 .pc_decode = nfs3svc_decode_getaclargs,
 244                 .pc_encode = nfs3svc_encode_getaclres,
 245                 .pc_release = nfs3svc_release_getacl,
 246                 .pc_argsize = sizeof(struct nfsd3_getaclargs),
 247                 .pc_argzero = sizeof(struct nfsd3_getaclargs),
 248                 .pc_ressize = sizeof(struct nfsd3_getaclres),
 249                 .pc_cachetype = RC_NOCACHE,
 250                 .pc_xdrressize = ST+1+2*(1+ACL),
 251                 .pc_name = "GETACL",
 252         },
 253         [ACLPROC3_SETACL] = {
 254                 .pc_func = nfsd3_proc_setacl,
 255                 .pc_decode = nfs3svc_decode_setaclargs,
 256                 .pc_encode = nfs3svc_encode_setaclres,
 257                 .pc_release = nfs3svc_release_fhandle,
 258                 .pc_argsize = sizeof(struct nfsd3_setaclargs),
 259                 .pc_argzero = sizeof(struct nfsd3_setaclargs),
 260                 .pc_ressize = sizeof(struct nfsd3_attrstat),
 261                 .pc_cachetype = RC_NOCACHE,
 262                 .pc_xdrressize = ST+pAT,
 263                 .pc_name = "SETACL",
 264         },
 265 };
 266
 267 static DEFINE_PER_CPU_ALIGNED(unsigned long,
 268                               nfsd_acl_count3[ARRAY_SIZE(nfsd_acl_procedures3)]);
 269 const struct svc_version nfsd_acl_version3 = {
 270         .vs_vers        = 3,
 271         .vs_nproc       = ARRAY_SIZE(nfsd_acl_procedures3),
 272         .vs_proc        = nfsd_acl_procedures3,
 273         .vs_count       = nfsd_acl_count3,
 274         .vs_dispatch    = nfsd_dispatch,
 275         .vs_xdrsize     = NFS3_SVC_XDRSIZE,
 276 };
 277