diff options
Diffstat (limited to 'source3/modules/nfs4acl_xattr_ndr.c')
| -rw-r--r-- | source3/modules/nfs4acl_xattr_ndr.c | 300 |
1 files changed, 300 insertions, 0 deletions
diff --git a/source3/modules/nfs4acl_xattr_ndr.c b/source3/modules/nfs4acl_xattr_ndr.c new file mode 100644 index 0000000..ffa3e69 --- /dev/null +++ b/source3/modules/nfs4acl_xattr_ndr.c @@ -0,0 +1,300 @@ +/* + * Convert NFSv4 acls stored per http://www.suse.de/~agruen/nfs4acl/ to NT acls and vice versa. + * + * Copyright (C) Jiri Sasek, 2007 + * based on the foobar.c module which is copyrighted by Volker Lendecke + * based on pvfs_acl_nfs4.c Copyright (C) Andrew Tridgell 2006 + * + * based on vfs_fake_acls: + * Copyright (C) Tim Potter, 1999-2000 + * Copyright (C) Alexander Bokovoy, 2002 + * Copyright (C) Andrew Bartlett, 2002,2012 + * Copyright (C) Ralph Boehme 2017 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <http://www.gnu.org/licenses/>. + * + */ + +#include "includes.h" +#include "system/filesys.h" +#include "smbd/smbd.h" +#include "nfs4_acls.h" +#include "librpc/gen_ndr/ndr_nfs4acl.h" +#include "nfs4acl_xattr.h" +#include "nfs4acl_xattr_ndr.h" + +#undef DBGC_CLASS +#define DBGC_CLASS DBGC_VFS + +static struct nfs4acl *nfs4acl_blob2acl(DATA_BLOB *blob, TALLOC_CTX *mem_ctx) +{ + enum ndr_err_code ndr_err; + struct nfs4acl *acl = talloc_zero(mem_ctx, struct nfs4acl); + + if (acl == NULL) { + errno = ENOMEM; + return NULL; + } + + ndr_err = ndr_pull_struct_blob(blob, acl, acl, + (ndr_pull_flags_fn_t)ndr_pull_nfs4acl); + + if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { + DBG_ERR("ndr_pull_acl_t failed: %s\n", ndr_errstr(ndr_err)); + TALLOC_FREE(acl); + return NULL; + } + return acl; +} + +static DATA_BLOB nfs4acl_acl2blob(TALLOC_CTX *mem_ctx, struct nfs4acl *acl) +{ + enum ndr_err_code ndr_err; + DATA_BLOB blob; + + ndr_err = ndr_push_struct_blob(&blob, mem_ctx, acl, + (ndr_push_flags_fn_t)ndr_push_nfs4acl); + + if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { + DBG_ERR("ndr_push_acl_t failed: %s\n", ndr_errstr(ndr_err)); + return data_blob_null; + } + return blob; +} + +static uint16_t nfs4acl_to_smb4acl_flags(uint8_t nfs4acl_flags) +{ + uint16_t smb4acl_flags = SEC_DESC_SELF_RELATIVE; + + if (nfs4acl_flags & ACL4_AUTO_INHERIT) { + smb4acl_flags |= SEC_DESC_DACL_AUTO_INHERITED; + } + if (nfs4acl_flags & ACL4_PROTECTED) { + smb4acl_flags |= SEC_DESC_DACL_PROTECTED; + } + if (nfs4acl_flags & ACL4_DEFAULTED) { + smb4acl_flags |= SEC_DESC_DACL_DEFAULTED; + } + + return smb4acl_flags; +} + +NTSTATUS nfs4acl_ndr_blob_to_smb4(struct vfs_handle_struct *handle, + TALLOC_CTX *mem_ctx, + DATA_BLOB *blob, + struct SMB4ACL_T **_smb4acl) +{ + struct nfs4acl *nfs4acl = NULL; + struct SMB4ACL_T *smb4acl = NULL; + TALLOC_CTX *frame = talloc_stackframe(); + struct nfs4acl_config *config = NULL; + int i; + + SMB_VFS_HANDLE_GET_DATA(handle, config, + struct nfs4acl_config, + return NT_STATUS_INTERNAL_ERROR); + + nfs4acl = nfs4acl_blob2acl(blob, frame); + if (nfs4acl == NULL) { + TALLOC_FREE(frame); + return NT_STATUS_INTERNAL_ERROR; + } + + smb4acl = smb_create_smb4acl(mem_ctx); + if (smb4acl == NULL) { + TALLOC_FREE(frame); + return NT_STATUS_NO_MEMORY; + } + + if (config->nfs_version > ACL4_XATTR_VERSION_40 && + nfs4acl->a_version > ACL4_XATTR_VERSION_40) + { + uint16_t smb4acl_flags; + + smb4acl_flags = nfs4acl_to_smb4acl_flags(nfs4acl->a_flags); + smbacl4_set_controlflags(smb4acl, smb4acl_flags); + } + + for (i = 0; i < nfs4acl->a_count; i++) { + SMB_ACE4PROP_T aceprop; + + aceprop.aceType = (uint32_t) nfs4acl->ace[i].e_type; + aceprop.aceFlags = (uint32_t) nfs4acl->ace[i].e_flags; + aceprop.aceMask = (uint32_t) nfs4acl->ace[i].e_mask; + aceprop.who.id = (uint32_t) nfs4acl->ace[i].e_id; + + if (!strcmp(nfs4acl->ace[i].e_who, + NFS4ACL_XATTR_OWNER_WHO)) { + aceprop.flags = SMB_ACE4_ID_SPECIAL; + aceprop.who.special_id = SMB_ACE4_WHO_OWNER; + } else if (!strcmp(nfs4acl->ace[i].e_who, + NFS4ACL_XATTR_GROUP_WHO)) { + aceprop.flags = SMB_ACE4_ID_SPECIAL; + aceprop.who.special_id = SMB_ACE4_WHO_GROUP; + } else if (!strcmp(nfs4acl->ace[i].e_who, + NFS4ACL_XATTR_EVERYONE_WHO)) { + aceprop.flags = SMB_ACE4_ID_SPECIAL; + aceprop.who.special_id = SMB_ACE4_WHO_EVERYONE; + } else { + aceprop.flags = 0; + } + + if (smb_add_ace4(smb4acl, &aceprop) == NULL) { + TALLOC_FREE(frame); + return NT_STATUS_NO_MEMORY; + } + } + + *_smb4acl = smb4acl; + TALLOC_FREE(frame); + return NT_STATUS_OK; +} + +static uint8_t smb4acl_to_nfs4acl_flags(uint16_t smb4acl_flags) +{ + uint8_t flags = 0; + + if (smb4acl_flags & SEC_DESC_DACL_AUTO_INHERITED) { + flags |= ACL4_AUTO_INHERIT; + } + if (smb4acl_flags & SEC_DESC_DACL_PROTECTED) { + flags |= ACL4_PROTECTED; + } + if (smb4acl_flags & SEC_DESC_DACL_DEFAULTED) { + flags |= ACL4_DEFAULTED; + } + + return flags; +} + +static bool nfs4acl_smb4acl2nfs4acl(vfs_handle_struct *handle, + TALLOC_CTX *mem_ctx, + struct SMB4ACL_T *smbacl, + struct nfs4acl **_nfs4acl, + bool denymissingspecial) +{ + struct nfs4acl_config *config = NULL; + struct nfs4acl *nfs4acl = NULL; + struct SMB4ACE_T *smbace = NULL; + bool have_special_id = false; + int i; + + SMB_VFS_HANDLE_GET_DATA(handle, config, + struct nfs4acl_config, + return false); + + nfs4acl = talloc_zero(mem_ctx, struct nfs4acl); + if (nfs4acl == NULL) { + errno = ENOMEM; + return false; + } + + nfs4acl->a_count = smb_get_naces(smbacl); + + nfs4acl->ace = talloc_zero_array(nfs4acl, struct nfs4ace, + nfs4acl->a_count); + if (nfs4acl->ace == NULL) { + TALLOC_FREE(nfs4acl); + errno = ENOMEM; + return false; + } + + nfs4acl->a_version = config->nfs_version; + if (nfs4acl->a_version > ACL4_XATTR_VERSION_40) { + uint16_t smb4acl_flags; + uint8_t flags; + + smb4acl_flags = smbacl4_get_controlflags(smbacl); + flags = smb4acl_to_nfs4acl_flags(smb4acl_flags); + nfs4acl->a_flags = flags; + } + + for (smbace = smb_first_ace4(smbacl), i = 0; + smbace != NULL; + smbace = smb_next_ace4(smbace), i++) + { + SMB_ACE4PROP_T *aceprop = smb_get_ace4(smbace); + + nfs4acl->ace[i].e_type = aceprop->aceType; + nfs4acl->ace[i].e_flags = aceprop->aceFlags; + nfs4acl->ace[i].e_mask = aceprop->aceMask; + nfs4acl->ace[i].e_id = aceprop->who.id; + if(aceprop->flags & SMB_ACE4_ID_SPECIAL) { + switch(aceprop->who.special_id) { + case SMB_ACE4_WHO_EVERYONE: + nfs4acl->ace[i].e_who = + NFS4ACL_XATTR_EVERYONE_WHO; + break; + case SMB_ACE4_WHO_OWNER: + nfs4acl->ace[i].e_who = + NFS4ACL_XATTR_OWNER_WHO; + break; + case SMB_ACE4_WHO_GROUP: + nfs4acl->ace[i].e_who = + NFS4ACL_XATTR_GROUP_WHO; + break; + default: + DBG_DEBUG("unsupported special_id %d\n", + aceprop->who.special_id); + continue; /* don't add it !!! */ + } + have_special_id = true; + } else { + nfs4acl->ace[i].e_who = ""; + } + } + + if (!have_special_id && denymissingspecial) { + TALLOC_FREE(nfs4acl); + errno = EACCES; + return false; + } + + SMB_ASSERT(i == nfs4acl->a_count); + + *_nfs4acl = nfs4acl; + return true; +} + +NTSTATUS nfs4acl_smb4acl_to_ndr_blob(vfs_handle_struct *handle, + TALLOC_CTX *mem_ctx, + struct SMB4ACL_T *smb4acl, + DATA_BLOB *_blob) +{ + struct nfs4acl *nfs4acl = NULL; + DATA_BLOB blob; + bool denymissingspecial; + bool ok; + + denymissingspecial = lp_parm_bool(SNUM(handle->conn), + "nfs4acl_xattr", + "denymissingspecial", false); + + ok = nfs4acl_smb4acl2nfs4acl(handle, talloc_tos(), smb4acl, &nfs4acl, + denymissingspecial); + if (!ok) { + DBG_ERR("Failed to convert smb ACL to nfs4 ACL.\n"); + return NT_STATUS_INTERNAL_ERROR; + } + + blob = nfs4acl_acl2blob(mem_ctx, nfs4acl); + TALLOC_FREE(nfs4acl); + if (blob.data == NULL) { + DBG_ERR("Failed to convert ACL to linear blob for xattr\n"); + return NT_STATUS_INTERNAL_ERROR; + } + + *_blob = blob; + return NT_STATUS_OK; +} |