mirror of
https://github.com/samba-team/samba.git
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bd9285b197
We need to migrate all pathname based VFS calls to use a struct to finish modernising the VFS with extra timestamp and flags parameters. Signed-off-by: Jeremy Allison <jra@samba.org> Reviewed-by: Richard Sharpe <realrichardsharpe@gmail.com>
1479 lines
38 KiB
C
1479 lines
38 KiB
C
/*
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* Store Windows ACLs in data store - common functions.
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* #included into modules/vfs_acl_xattr.c and modules/vfs_acl_tdb.c
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*
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* Copyright (C) Volker Lendecke, 2008
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* Copyright (C) Jeremy Allison, 2009
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* Copyright (C) Ralph Böhme, 2016
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "smbd/smbd.h"
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#include "system/filesys.h"
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#include "../libcli/security/security.h"
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#include "../librpc/gen_ndr/ndr_security.h"
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#include "../lib/util/bitmap.h"
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#include "passdb/lookup_sid.h"
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static NTSTATUS create_acl_blob(const struct security_descriptor *psd,
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DATA_BLOB *pblob,
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uint16_t hash_type,
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uint8_t hash[XATTR_SD_HASH_SIZE]);
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static NTSTATUS get_acl_blob(TALLOC_CTX *ctx,
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vfs_handle_struct *handle,
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files_struct *fsp,
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const struct smb_filename *smb_fname,
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DATA_BLOB *pblob);
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static NTSTATUS store_acl_blob_fsp(vfs_handle_struct *handle,
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files_struct *fsp,
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DATA_BLOB *pblob);
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#define HASH_SECURITY_INFO (SECINFO_OWNER | \
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SECINFO_GROUP | \
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SECINFO_DACL | \
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SECINFO_SACL)
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enum default_acl_style {DEFAULT_ACL_POSIX, DEFAULT_ACL_WINDOWS};
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static const struct enum_list default_acl_style[] = {
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{DEFAULT_ACL_POSIX, "posix"},
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{DEFAULT_ACL_WINDOWS, "windows"}
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};
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struct acl_common_config {
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bool ignore_system_acls;
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enum default_acl_style default_acl_style;
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};
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static bool init_acl_common_config(vfs_handle_struct *handle)
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{
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struct acl_common_config *config = NULL;
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config = talloc_zero(handle->conn, struct acl_common_config);
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if (config == NULL) {
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DBG_ERR("talloc_zero() failed\n");
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errno = ENOMEM;
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return false;
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}
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config->ignore_system_acls = lp_parm_bool(SNUM(handle->conn),
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ACL_MODULE_NAME,
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"ignore system acls",
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false);
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config->default_acl_style = lp_parm_enum(SNUM(handle->conn),
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ACL_MODULE_NAME,
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"default acl style",
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default_acl_style,
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DEFAULT_ACL_POSIX);
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SMB_VFS_HANDLE_SET_DATA(handle, config, NULL,
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struct acl_common_config,
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return false);
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return true;
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}
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/*******************************************************************
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Hash a security descriptor.
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*******************************************************************/
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static NTSTATUS hash_blob_sha256(DATA_BLOB blob,
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uint8_t *hash)
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{
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SHA256_CTX tctx;
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memset(hash, '\0', XATTR_SD_HASH_SIZE);
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samba_SHA256_Init(&tctx);
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samba_SHA256_Update(&tctx, blob.data, blob.length);
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samba_SHA256_Final(hash, &tctx);
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return NT_STATUS_OK;
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}
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/*******************************************************************
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Hash a security descriptor.
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*******************************************************************/
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static NTSTATUS hash_sd_sha256(struct security_descriptor *psd,
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uint8_t *hash)
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{
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DATA_BLOB blob;
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NTSTATUS status;
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memset(hash, '\0', XATTR_SD_HASH_SIZE);
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status = create_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash);
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if (!NT_STATUS_IS_OK(status)) {
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return status;
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}
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return hash_blob_sha256(blob, hash);
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}
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/*******************************************************************
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Parse out a struct security_descriptor from a DATA_BLOB.
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*******************************************************************/
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static NTSTATUS parse_acl_blob(const DATA_BLOB *pblob,
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TALLOC_CTX *mem_ctx,
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struct security_descriptor **ppdesc,
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uint16_t *p_hash_type,
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uint16_t *p_version,
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uint8_t hash[XATTR_SD_HASH_SIZE],
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uint8_t sys_acl_hash[XATTR_SD_HASH_SIZE])
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{
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struct xattr_NTACL xacl;
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enum ndr_err_code ndr_err;
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size_t sd_size;
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TALLOC_CTX *frame = talloc_stackframe();
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ndr_err = ndr_pull_struct_blob(pblob, frame, &xacl,
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(ndr_pull_flags_fn_t)ndr_pull_xattr_NTACL);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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DBG_INFO("ndr_pull_xattr_NTACL failed: %s\n",
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ndr_errstr(ndr_err));
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TALLOC_FREE(frame);
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return ndr_map_error2ntstatus(ndr_err);
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}
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*p_version = xacl.version;
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switch (xacl.version) {
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case 1:
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*ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
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xacl.info.sd->type | SEC_DESC_SELF_RELATIVE,
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xacl.info.sd->owner_sid,
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xacl.info.sd->group_sid,
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xacl.info.sd->sacl,
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xacl.info.sd->dacl,
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&sd_size);
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/* No hash - null out. */
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*p_hash_type = XATTR_SD_HASH_TYPE_NONE;
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memset(hash, '\0', XATTR_SD_HASH_SIZE);
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break;
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case 2:
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*ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
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xacl.info.sd_hs2->sd->type | SEC_DESC_SELF_RELATIVE,
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xacl.info.sd_hs2->sd->owner_sid,
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xacl.info.sd_hs2->sd->group_sid,
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xacl.info.sd_hs2->sd->sacl,
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xacl.info.sd_hs2->sd->dacl,
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&sd_size);
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/* No hash - null out. */
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*p_hash_type = XATTR_SD_HASH_TYPE_NONE;
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memset(hash, '\0', XATTR_SD_HASH_SIZE);
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break;
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case 3:
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*ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
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xacl.info.sd_hs3->sd->type | SEC_DESC_SELF_RELATIVE,
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xacl.info.sd_hs3->sd->owner_sid,
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xacl.info.sd_hs3->sd->group_sid,
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xacl.info.sd_hs3->sd->sacl,
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xacl.info.sd_hs3->sd->dacl,
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&sd_size);
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*p_hash_type = xacl.info.sd_hs3->hash_type;
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/* Current version 3 (if no sys acl hash available). */
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memcpy(hash, xacl.info.sd_hs3->hash, XATTR_SD_HASH_SIZE);
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break;
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case 4:
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*ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
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xacl.info.sd_hs4->sd->type | SEC_DESC_SELF_RELATIVE,
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xacl.info.sd_hs4->sd->owner_sid,
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xacl.info.sd_hs4->sd->group_sid,
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xacl.info.sd_hs4->sd->sacl,
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xacl.info.sd_hs4->sd->dacl,
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&sd_size);
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*p_hash_type = xacl.info.sd_hs4->hash_type;
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/* Current version 4. */
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memcpy(hash, xacl.info.sd_hs4->hash, XATTR_SD_HASH_SIZE);
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memcpy(sys_acl_hash, xacl.info.sd_hs4->sys_acl_hash, XATTR_SD_HASH_SIZE);
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break;
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default:
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TALLOC_FREE(frame);
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return NT_STATUS_REVISION_MISMATCH;
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}
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TALLOC_FREE(frame);
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return (*ppdesc != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
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}
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/*******************************************************************
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Create a DATA_BLOB from a hash of the security descriptor storead at
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the system layer and the NT ACL we wish to preserve
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*******************************************************************/
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static NTSTATUS create_acl_blob(const struct security_descriptor *psd,
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DATA_BLOB *pblob,
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uint16_t hash_type,
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uint8_t hash[XATTR_SD_HASH_SIZE])
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{
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struct xattr_NTACL xacl;
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struct security_descriptor_hash_v3 sd_hs3;
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enum ndr_err_code ndr_err;
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TALLOC_CTX *ctx = talloc_tos();
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ZERO_STRUCT(xacl);
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ZERO_STRUCT(sd_hs3);
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xacl.version = 3;
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xacl.info.sd_hs3 = &sd_hs3;
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xacl.info.sd_hs3->sd = discard_const_p(struct security_descriptor, psd);
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xacl.info.sd_hs3->hash_type = hash_type;
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memcpy(&xacl.info.sd_hs3->hash[0], hash, XATTR_SD_HASH_SIZE);
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ndr_err = ndr_push_struct_blob(
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pblob, ctx, &xacl,
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(ndr_push_flags_fn_t)ndr_push_xattr_NTACL);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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DBG_INFO("ndr_push_xattr_NTACL failed: %s\n",
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ndr_errstr(ndr_err));
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return ndr_map_error2ntstatus(ndr_err);
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}
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return NT_STATUS_OK;
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}
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/*******************************************************************
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Create a DATA_BLOB from a hash of the security descriptors
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(system and NT) stored at the system layer and the NT ACL we wish
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to preserve.
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*******************************************************************/
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static NTSTATUS create_sys_acl_blob(const struct security_descriptor *psd,
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DATA_BLOB *pblob,
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uint16_t hash_type,
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uint8_t hash[XATTR_SD_HASH_SIZE],
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const char *description,
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uint8_t sys_acl_hash[XATTR_SD_HASH_SIZE])
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{
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struct xattr_NTACL xacl;
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struct security_descriptor_hash_v4 sd_hs4;
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enum ndr_err_code ndr_err;
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TALLOC_CTX *ctx = talloc_tos();
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NTTIME nttime_now;
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struct timeval now = timeval_current();
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nttime_now = timeval_to_nttime(&now);
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ZERO_STRUCT(xacl);
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ZERO_STRUCT(sd_hs4);
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xacl.version = 4;
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xacl.info.sd_hs4 = &sd_hs4;
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xacl.info.sd_hs4->sd = discard_const_p(struct security_descriptor, psd);
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xacl.info.sd_hs4->hash_type = hash_type;
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memcpy(&xacl.info.sd_hs4->hash[0], hash, XATTR_SD_HASH_SIZE);
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xacl.info.sd_hs4->description = description;
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xacl.info.sd_hs4->time = nttime_now;
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memcpy(&xacl.info.sd_hs4->sys_acl_hash[0], sys_acl_hash, XATTR_SD_HASH_SIZE);
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ndr_err = ndr_push_struct_blob(
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pblob, ctx, &xacl,
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(ndr_push_flags_fn_t)ndr_push_xattr_NTACL);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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DBG_INFO("ndr_push_xattr_NTACL failed: %s\n",
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ndr_errstr(ndr_err));
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return ndr_map_error2ntstatus(ndr_err);
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}
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return NT_STATUS_OK;
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}
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/*******************************************************************
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Add in 3 inheritable components for a non-inheritable directory ACL.
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CREATOR_OWNER/CREATOR_GROUP/WORLD.
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*******************************************************************/
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static NTSTATUS add_directory_inheritable_components(vfs_handle_struct *handle,
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const char *name,
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SMB_STRUCT_STAT *psbuf,
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struct security_descriptor *psd)
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{
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struct connection_struct *conn = handle->conn;
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int num_aces = (psd->dacl ? psd->dacl->num_aces : 0);
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struct smb_filename smb_fname;
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enum security_ace_type acltype;
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uint32_t access_mask;
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mode_t dir_mode;
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mode_t file_mode;
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mode_t mode;
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struct security_ace *new_ace_list;
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if (psd->dacl) {
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new_ace_list = talloc_zero_array(psd->dacl,
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struct security_ace,
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num_aces + 3);
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} else {
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/*
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* make_sec_acl() at the bottom of this function
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* dupliates new_ace_list
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*/
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new_ace_list = talloc_zero_array(talloc_tos(),
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struct security_ace,
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num_aces + 3);
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}
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if (new_ace_list == NULL) {
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return NT_STATUS_NO_MEMORY;
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}
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/* Fake a quick smb_filename. */
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ZERO_STRUCT(smb_fname);
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smb_fname.st = *psbuf;
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smb_fname.base_name = discard_const_p(char, name);
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dir_mode = unix_mode(conn,
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FILE_ATTRIBUTE_DIRECTORY, &smb_fname, NULL);
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file_mode = unix_mode(conn,
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FILE_ATTRIBUTE_ARCHIVE, &smb_fname, NULL);
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mode = dir_mode | file_mode;
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DBG_DEBUG("directory %s, mode = 0%o\n", name, (unsigned int)mode);
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if (num_aces) {
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memcpy(new_ace_list, psd->dacl->aces,
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num_aces * sizeof(struct security_ace));
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}
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access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
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mode & 0700, false);
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init_sec_ace(&new_ace_list[num_aces],
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&global_sid_Creator_Owner,
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acltype,
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access_mask,
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SEC_ACE_FLAG_CONTAINER_INHERIT|
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SEC_ACE_FLAG_OBJECT_INHERIT|
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SEC_ACE_FLAG_INHERIT_ONLY);
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access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
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(mode << 3) & 0700, false);
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init_sec_ace(&new_ace_list[num_aces+1],
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&global_sid_Creator_Group,
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acltype,
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access_mask,
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SEC_ACE_FLAG_CONTAINER_INHERIT|
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SEC_ACE_FLAG_OBJECT_INHERIT|
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SEC_ACE_FLAG_INHERIT_ONLY);
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access_mask = map_canon_ace_perms(SNUM(conn), &acltype,
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(mode << 6) & 0700, false);
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init_sec_ace(&new_ace_list[num_aces+2],
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&global_sid_World,
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acltype,
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access_mask,
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SEC_ACE_FLAG_CONTAINER_INHERIT|
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SEC_ACE_FLAG_OBJECT_INHERIT|
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SEC_ACE_FLAG_INHERIT_ONLY);
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if (psd->dacl) {
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psd->dacl->aces = new_ace_list;
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psd->dacl->num_aces += 3;
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psd->dacl->size += new_ace_list[num_aces].size +
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new_ace_list[num_aces+1].size +
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new_ace_list[num_aces+2].size;
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} else {
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psd->dacl = make_sec_acl(psd,
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NT4_ACL_REVISION,
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3,
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new_ace_list);
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if (psd->dacl == NULL) {
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return NT_STATUS_NO_MEMORY;
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}
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}
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return NT_STATUS_OK;
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}
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static NTSTATUS make_default_acl_posix(TALLOC_CTX *ctx,
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const char *name,
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SMB_STRUCT_STAT *psbuf,
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struct security_descriptor **ppdesc)
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{
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struct dom_sid owner_sid, group_sid;
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size_t size = 0;
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struct security_ace aces[4];
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uint32_t access_mask = 0;
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mode_t mode = psbuf->st_ex_mode;
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struct security_acl *new_dacl = NULL;
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int idx = 0;
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DBG_DEBUG("file %s mode = 0%o\n",name, (int)mode);
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uid_to_sid(&owner_sid, psbuf->st_ex_uid);
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gid_to_sid(&group_sid, psbuf->st_ex_gid);
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/*
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We provide up to 4 ACEs
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- Owner
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- Group
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- Everyone
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- NT System
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*/
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if (mode & S_IRUSR) {
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if (mode & S_IWUSR) {
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access_mask |= SEC_RIGHTS_FILE_ALL;
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} else {
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access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
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}
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}
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if (mode & S_IWUSR) {
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access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
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}
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init_sec_ace(&aces[idx],
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&owner_sid,
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SEC_ACE_TYPE_ACCESS_ALLOWED,
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access_mask,
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0);
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idx++;
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access_mask = 0;
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if (mode & S_IRGRP) {
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access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
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}
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if (mode & S_IWGRP) {
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/* note that delete is not granted - this matches posix behaviour */
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access_mask |= SEC_RIGHTS_FILE_WRITE;
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}
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if (access_mask) {
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init_sec_ace(&aces[idx],
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&group_sid,
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SEC_ACE_TYPE_ACCESS_ALLOWED,
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access_mask,
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0);
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idx++;
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}
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access_mask = 0;
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if (mode & S_IROTH) {
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access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
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}
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if (mode & S_IWOTH) {
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access_mask |= SEC_RIGHTS_FILE_WRITE;
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}
|
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if (access_mask) {
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init_sec_ace(&aces[idx],
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&global_sid_World,
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SEC_ACE_TYPE_ACCESS_ALLOWED,
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access_mask,
|
|
0);
|
|
idx++;
|
|
}
|
|
|
|
init_sec_ace(&aces[idx],
|
|
&global_sid_System,
|
|
SEC_ACE_TYPE_ACCESS_ALLOWED,
|
|
SEC_RIGHTS_FILE_ALL,
|
|
0);
|
|
idx++;
|
|
|
|
new_dacl = make_sec_acl(ctx,
|
|
NT4_ACL_REVISION,
|
|
idx,
|
|
aces);
|
|
|
|
if (!new_dacl) {
|
|
return NT_STATUS_NO_MEMORY;
|
|
}
|
|
|
|
*ppdesc = make_sec_desc(ctx,
|
|
SECURITY_DESCRIPTOR_REVISION_1,
|
|
SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
|
|
&owner_sid,
|
|
&group_sid,
|
|
NULL,
|
|
new_dacl,
|
|
&size);
|
|
if (!*ppdesc) {
|
|
return NT_STATUS_NO_MEMORY;
|
|
}
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
static NTSTATUS make_default_acl_windows(TALLOC_CTX *ctx,
|
|
const char *name,
|
|
SMB_STRUCT_STAT *psbuf,
|
|
struct security_descriptor **ppdesc)
|
|
{
|
|
struct dom_sid owner_sid, group_sid;
|
|
size_t size = 0;
|
|
struct security_ace aces[4];
|
|
uint32_t access_mask = 0;
|
|
mode_t mode = psbuf->st_ex_mode;
|
|
struct security_acl *new_dacl = NULL;
|
|
int idx = 0;
|
|
|
|
DBG_DEBUG("file [%s] mode [0%o]\n", name, (int)mode);
|
|
|
|
uid_to_sid(&owner_sid, psbuf->st_ex_uid);
|
|
gid_to_sid(&group_sid, psbuf->st_ex_gid);
|
|
|
|
/*
|
|
* We provide 2 ACEs:
|
|
* - Owner
|
|
* - NT System
|
|
*/
|
|
|
|
if (mode & S_IRUSR) {
|
|
if (mode & S_IWUSR) {
|
|
access_mask |= SEC_RIGHTS_FILE_ALL;
|
|
} else {
|
|
access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
|
|
}
|
|
}
|
|
if (mode & S_IWUSR) {
|
|
access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
|
|
}
|
|
|
|
init_sec_ace(&aces[idx],
|
|
&owner_sid,
|
|
SEC_ACE_TYPE_ACCESS_ALLOWED,
|
|
access_mask,
|
|
0);
|
|
idx++;
|
|
|
|
init_sec_ace(&aces[idx],
|
|
&global_sid_System,
|
|
SEC_ACE_TYPE_ACCESS_ALLOWED,
|
|
SEC_RIGHTS_FILE_ALL,
|
|
0);
|
|
idx++;
|
|
|
|
new_dacl = make_sec_acl(ctx,
|
|
NT4_ACL_REVISION,
|
|
idx,
|
|
aces);
|
|
|
|
if (!new_dacl) {
|
|
return NT_STATUS_NO_MEMORY;
|
|
}
|
|
|
|
*ppdesc = make_sec_desc(ctx,
|
|
SECURITY_DESCRIPTOR_REVISION_1,
|
|
SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
|
|
&owner_sid,
|
|
&group_sid,
|
|
NULL,
|
|
new_dacl,
|
|
&size);
|
|
if (!*ppdesc) {
|
|
return NT_STATUS_NO_MEMORY;
|
|
}
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
static NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
|
|
struct acl_common_config *config,
|
|
const char *name,
|
|
SMB_STRUCT_STAT *psbuf,
|
|
struct security_descriptor **ppdesc)
|
|
{
|
|
NTSTATUS status;
|
|
|
|
switch (config->default_acl_style) {
|
|
|
|
case DEFAULT_ACL_POSIX:
|
|
status = make_default_acl_posix(ctx, name, psbuf, ppdesc);
|
|
break;
|
|
|
|
case DEFAULT_ACL_WINDOWS:
|
|
status = make_default_acl_windows(ctx, name, psbuf, ppdesc);
|
|
break;
|
|
|
|
default:
|
|
DBG_ERR("unknown acl style %d", config->default_acl_style);
|
|
status = NT_STATUS_INTERNAL_ERROR;
|
|
break;
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* Validate an ACL blob
|
|
*
|
|
* This validates an ACL blob against the underlying filesystem ACL. If this
|
|
* function returns NT_STATUS_OK ppsd can be
|
|
*
|
|
* 1. the ACL from the blob (psd_from_fs=false), or
|
|
* 2. the ACL from the fs (psd_from_fs=true), or
|
|
* 3. NULL (!)
|
|
*
|
|
* If the return value is anything else then NT_STATUS_OK, ppsd is set to NULL
|
|
* and psd_from_fs set to false.
|
|
*
|
|
* Returning the underlying filesystem ACL in case no. 2 is really just an
|
|
* optimisation, because some validations have to fetch the filesytem ACL as
|
|
* part of the validation, so we already have it available and callers might
|
|
* need it as well.
|
|
**/
|
|
static NTSTATUS validate_nt_acl_blob(TALLOC_CTX *mem_ctx,
|
|
vfs_handle_struct *handle,
|
|
files_struct *fsp,
|
|
const struct smb_filename *smb_fname,
|
|
const DATA_BLOB *blob,
|
|
struct security_descriptor **ppsd,
|
|
bool *psd_is_from_fs)
|
|
{
|
|
NTSTATUS status;
|
|
uint16_t hash_type = XATTR_SD_HASH_TYPE_NONE;
|
|
uint16_t xattr_version = 0;
|
|
uint8_t hash[XATTR_SD_HASH_SIZE];
|
|
uint8_t sys_acl_hash[XATTR_SD_HASH_SIZE];
|
|
uint8_t hash_tmp[XATTR_SD_HASH_SIZE];
|
|
uint8_t sys_acl_hash_tmp[XATTR_SD_HASH_SIZE];
|
|
struct security_descriptor *psd = NULL;
|
|
struct security_descriptor *psd_blob = NULL;
|
|
struct security_descriptor *psd_fs = NULL;
|
|
char *sys_acl_blob_description = NULL;
|
|
DATA_BLOB sys_acl_blob = { 0 };
|
|
struct acl_common_config *config = NULL;
|
|
|
|
*ppsd = NULL;
|
|
*psd_is_from_fs = false;
|
|
|
|
SMB_VFS_HANDLE_GET_DATA(handle, config,
|
|
struct acl_common_config,
|
|
return NT_STATUS_UNSUCCESSFUL);
|
|
|
|
status = parse_acl_blob(blob,
|
|
mem_ctx,
|
|
&psd_blob,
|
|
&hash_type,
|
|
&xattr_version,
|
|
&hash[0],
|
|
&sys_acl_hash[0]);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DBG_DEBUG("parse_acl_blob returned %s\n", nt_errstr(status));
|
|
goto fail;
|
|
}
|
|
|
|
/* determine which type of xattr we got */
|
|
switch (xattr_version) {
|
|
case 1:
|
|
case 2:
|
|
/* These xattr types are unilatteral, they do not
|
|
* require confirmation of the hash. In particular,
|
|
* the NTVFS file server uses version 1, but
|
|
* 'samba-tool ntacl' can set these as well */
|
|
*ppsd = psd_blob;
|
|
return NT_STATUS_OK;
|
|
case 3:
|
|
case 4:
|
|
if (config->ignore_system_acls) {
|
|
*ppsd = psd_blob;
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
break;
|
|
default:
|
|
DBG_DEBUG("ACL blob revision mismatch (%u) for file %s\n",
|
|
(unsigned int)hash_type, smb_fname->base_name);
|
|
TALLOC_FREE(psd_blob);
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
/* determine which type of xattr we got */
|
|
if (hash_type != XATTR_SD_HASH_TYPE_SHA256) {
|
|
DBG_DEBUG("ACL blob hash type (%u) unexpected for file %s\n",
|
|
(unsigned int)hash_type, smb_fname->base_name);
|
|
TALLOC_FREE(psd_blob);
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
/* determine which type of xattr we got */
|
|
switch (xattr_version) {
|
|
case 4:
|
|
{
|
|
int ret;
|
|
if (fsp) {
|
|
/* Get the full underlying sd, then hash. */
|
|
ret = SMB_VFS_NEXT_SYS_ACL_BLOB_GET_FD(handle,
|
|
fsp,
|
|
mem_ctx,
|
|
&sys_acl_blob_description,
|
|
&sys_acl_blob);
|
|
} else {
|
|
/* Get the full underlying sd, then hash. */
|
|
ret = SMB_VFS_NEXT_SYS_ACL_BLOB_GET_FILE(handle,
|
|
smb_fname,
|
|
mem_ctx,
|
|
&sys_acl_blob_description,
|
|
&sys_acl_blob);
|
|
}
|
|
|
|
/* If we fail to get the ACL blob (for some reason) then this
|
|
* is not fatal, we just work based on the NT ACL only */
|
|
if (ret == 0) {
|
|
status = hash_blob_sha256(sys_acl_blob, sys_acl_hash_tmp);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
goto fail;
|
|
}
|
|
|
|
TALLOC_FREE(sys_acl_blob_description);
|
|
TALLOC_FREE(sys_acl_blob.data);
|
|
|
|
if (memcmp(&sys_acl_hash[0], &sys_acl_hash_tmp[0],
|
|
XATTR_SD_HASH_SIZE) == 0) {
|
|
/* Hash matches, return blob sd. */
|
|
DBG_DEBUG("blob hash matches for file %s\n",
|
|
smb_fname->base_name);
|
|
*ppsd = psd_blob;
|
|
return NT_STATUS_OK;
|
|
}
|
|
}
|
|
|
|
/* Otherwise, fall though and see if the NT ACL hash matches */
|
|
}
|
|
case 3:
|
|
/* Get the full underlying sd for the hash
|
|
or to return as backup. */
|
|
if (fsp) {
|
|
status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
|
|
fsp,
|
|
HASH_SECURITY_INFO,
|
|
mem_ctx,
|
|
&psd_fs);
|
|
} else {
|
|
status = SMB_VFS_NEXT_GET_NT_ACL(handle,
|
|
smb_fname,
|
|
HASH_SECURITY_INFO,
|
|
mem_ctx,
|
|
&psd_fs);
|
|
}
|
|
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DBG_DEBUG("get_next_acl for file %s returned %s\n",
|
|
smb_fname->base_name, nt_errstr(status));
|
|
goto fail;
|
|
}
|
|
|
|
status = hash_sd_sha256(psd_fs, hash_tmp);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
TALLOC_FREE(psd_blob);
|
|
*ppsd = psd_fs;
|
|
*psd_is_from_fs = true;
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
if (memcmp(&hash[0], &hash_tmp[0], XATTR_SD_HASH_SIZE) == 0) {
|
|
/* Hash matches, return blob sd. */
|
|
DBG_DEBUG("blob hash matches for file %s\n",
|
|
smb_fname->base_name);
|
|
*ppsd = psd_blob;
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
/* Hash doesn't match, return underlying sd. */
|
|
DBG_DEBUG("blob hash does not match for file %s - returning "
|
|
"file system SD mapping.\n",
|
|
smb_fname->base_name);
|
|
|
|
if (DEBUGLEVEL >= 10) {
|
|
DBG_DEBUG("acl for blob hash for %s is:\n",
|
|
smb_fname->base_name);
|
|
NDR_PRINT_DEBUG(security_descriptor, psd_fs);
|
|
}
|
|
|
|
TALLOC_FREE(psd_blob);
|
|
*ppsd = psd_fs;
|
|
*psd_is_from_fs = true;
|
|
}
|
|
|
|
return NT_STATUS_OK;
|
|
|
|
fail:
|
|
TALLOC_FREE(psd);
|
|
TALLOC_FREE(psd_blob);
|
|
TALLOC_FREE(psd_fs);
|
|
TALLOC_FREE(sys_acl_blob_description);
|
|
TALLOC_FREE(sys_acl_blob.data);
|
|
return status;
|
|
}
|
|
|
|
static NTSTATUS stat_fsp_or_smb_fname(vfs_handle_struct *handle,
|
|
files_struct *fsp,
|
|
const struct smb_filename *smb_fname,
|
|
SMB_STRUCT_STAT *sbuf,
|
|
SMB_STRUCT_STAT **psbuf)
|
|
{
|
|
NTSTATUS status;
|
|
int ret;
|
|
|
|
if (fsp) {
|
|
status = vfs_stat_fsp(fsp);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
return status;
|
|
}
|
|
*psbuf = &fsp->fsp_name->st;
|
|
} else {
|
|
/*
|
|
* https://bugzilla.samba.org/show_bug.cgi?id=11249
|
|
*
|
|
* We are currently guaranteed that 'name' here is a
|
|
* smb_fname->base_name, which *cannot* contain a stream name
|
|
* (':'). vfs_stat_smb_fname() splits a name into a base name +
|
|
* stream name, which when we get here we know we've already
|
|
* done. So we have to call the stat or lstat VFS calls
|
|
* directly here. Else, a base_name that contains a ':' (from a
|
|
* demangled name) will get split again.
|
|
*
|
|
* FIXME.
|
|
* This uglyness will go away once smb_fname is fully plumbed
|
|
* through the VFS.
|
|
*/
|
|
ret = vfs_stat_smb_basename(handle->conn,
|
|
smb_fname,
|
|
sbuf);
|
|
if (ret == -1) {
|
|
return map_nt_error_from_unix(errno);
|
|
}
|
|
}
|
|
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
/*******************************************************************
|
|
Pull a DATA_BLOB from an xattr given a pathname.
|
|
If the hash doesn't match, or doesn't exist - return the underlying
|
|
filesystem sd.
|
|
*******************************************************************/
|
|
|
|
static NTSTATUS get_nt_acl_internal(vfs_handle_struct *handle,
|
|
files_struct *fsp,
|
|
const struct smb_filename *smb_fname_in,
|
|
uint32_t security_info,
|
|
TALLOC_CTX *mem_ctx,
|
|
struct security_descriptor **ppdesc)
|
|
{
|
|
DATA_BLOB blob = data_blob_null;
|
|
NTSTATUS status;
|
|
struct security_descriptor *psd = NULL;
|
|
const struct smb_filename *smb_fname = NULL;
|
|
bool psd_is_from_fs = false;
|
|
struct acl_common_config *config = NULL;
|
|
|
|
SMB_VFS_HANDLE_GET_DATA(handle, config,
|
|
struct acl_common_config,
|
|
return NT_STATUS_UNSUCCESSFUL);
|
|
|
|
if (fsp && smb_fname_in == NULL) {
|
|
smb_fname = fsp->fsp_name;
|
|
} else {
|
|
smb_fname = smb_fname_in;
|
|
}
|
|
|
|
DBG_DEBUG("name=%s\n", smb_fname->base_name);
|
|
|
|
status = get_acl_blob(mem_ctx, handle, fsp, smb_fname, &blob);
|
|
if (NT_STATUS_IS_OK(status)) {
|
|
status = validate_nt_acl_blob(mem_ctx,
|
|
handle,
|
|
fsp,
|
|
smb_fname,
|
|
&blob,
|
|
&psd,
|
|
&psd_is_from_fs);
|
|
TALLOC_FREE(blob.data);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DBG_DEBUG("ACL validation for [%s] failed\n",
|
|
smb_fname->base_name);
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
if (psd == NULL) {
|
|
/* Get the full underlying sd, as we failed to get the
|
|
* blob for the hash, or the revision/hash type wasn't
|
|
* known */
|
|
|
|
if (config->ignore_system_acls) {
|
|
SMB_STRUCT_STAT sbuf;
|
|
SMB_STRUCT_STAT *psbuf = &sbuf;
|
|
|
|
status = stat_fsp_or_smb_fname(handle, fsp, smb_fname,
|
|
&sbuf, &psbuf);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
goto fail;
|
|
}
|
|
|
|
status = make_default_filesystem_acl(
|
|
mem_ctx,
|
|
config,
|
|
smb_fname->base_name,
|
|
psbuf,
|
|
&psd);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
goto fail;
|
|
}
|
|
} else {
|
|
if (fsp) {
|
|
status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
|
|
fsp,
|
|
security_info,
|
|
mem_ctx,
|
|
&psd);
|
|
} else {
|
|
status = SMB_VFS_NEXT_GET_NT_ACL(handle,
|
|
smb_fname,
|
|
security_info,
|
|
mem_ctx,
|
|
&psd);
|
|
}
|
|
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DBG_DEBUG("get_next_acl for file %s "
|
|
"returned %s\n",
|
|
smb_fname->base_name,
|
|
nt_errstr(status));
|
|
goto fail;
|
|
}
|
|
|
|
psd_is_from_fs = true;
|
|
}
|
|
}
|
|
|
|
if (psd_is_from_fs) {
|
|
SMB_STRUCT_STAT sbuf;
|
|
SMB_STRUCT_STAT *psbuf = &sbuf;
|
|
bool is_directory = false;
|
|
|
|
/*
|
|
* We're returning the underlying ACL from the
|
|
* filesystem. If it's a directory, and has no
|
|
* inheritable ACE entries we have to fake them.
|
|
*/
|
|
|
|
status = stat_fsp_or_smb_fname(handle, fsp, smb_fname,
|
|
&sbuf, &psbuf);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
goto fail;
|
|
}
|
|
|
|
is_directory = S_ISDIR(psbuf->st_ex_mode);
|
|
|
|
if (is_directory && !sd_has_inheritable_components(psd, true)) {
|
|
status = add_directory_inheritable_components(
|
|
handle,
|
|
smb_fname->base_name,
|
|
psbuf,
|
|
psd);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* The underlying POSIX module always sets the
|
|
* ~SEC_DESC_DACL_PROTECTED bit, as ACLs can't be inherited in
|
|
* this way under POSIX. Remove it for Windows-style ACLs.
|
|
*/
|
|
psd->type &= ~SEC_DESC_DACL_PROTECTED;
|
|
}
|
|
|
|
if (!(security_info & SECINFO_OWNER)) {
|
|
psd->owner_sid = NULL;
|
|
}
|
|
if (!(security_info & SECINFO_GROUP)) {
|
|
psd->group_sid = NULL;
|
|
}
|
|
if (!(security_info & SECINFO_DACL)) {
|
|
psd->type &= ~SEC_DESC_DACL_PRESENT;
|
|
psd->dacl = NULL;
|
|
}
|
|
if (!(security_info & SECINFO_SACL)) {
|
|
psd->type &= ~SEC_DESC_SACL_PRESENT;
|
|
psd->sacl = NULL;
|
|
}
|
|
|
|
if (DEBUGLEVEL >= 10) {
|
|
DBG_DEBUG("returning acl for %s is:\n",
|
|
smb_fname->base_name);
|
|
NDR_PRINT_DEBUG(security_descriptor, psd);
|
|
}
|
|
|
|
*ppdesc = psd;
|
|
|
|
return NT_STATUS_OK;
|
|
|
|
fail:
|
|
TALLOC_FREE(psd);
|
|
return status;
|
|
}
|
|
|
|
/*********************************************************************
|
|
Fetch a security descriptor given an fsp.
|
|
*********************************************************************/
|
|
|
|
static NTSTATUS fget_nt_acl_common(vfs_handle_struct *handle,
|
|
files_struct *fsp,
|
|
uint32_t security_info,
|
|
TALLOC_CTX *mem_ctx,
|
|
struct security_descriptor **ppdesc)
|
|
{
|
|
return get_nt_acl_internal(handle, fsp,
|
|
NULL, security_info, mem_ctx, ppdesc);
|
|
}
|
|
|
|
/*********************************************************************
|
|
Fetch a security descriptor given a pathname.
|
|
*********************************************************************/
|
|
|
|
static NTSTATUS get_nt_acl_common(vfs_handle_struct *handle,
|
|
const struct smb_filename *smb_fname,
|
|
uint32_t security_info,
|
|
TALLOC_CTX *mem_ctx,
|
|
struct security_descriptor **ppdesc)
|
|
{
|
|
return get_nt_acl_internal(handle,
|
|
NULL,
|
|
smb_fname,
|
|
security_info,
|
|
mem_ctx,
|
|
ppdesc);
|
|
}
|
|
|
|
/*********************************************************************
|
|
Set the underlying ACL (e.g. POSIX ACLS, POSIX owner, etc)
|
|
*********************************************************************/
|
|
static NTSTATUS set_underlying_acl(vfs_handle_struct *handle, files_struct *fsp,
|
|
struct security_descriptor *psd,
|
|
uint32_t security_info_sent,
|
|
bool chown_needed)
|
|
{
|
|
NTSTATUS status =
|
|
SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp, security_info_sent, psd);
|
|
if (!NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
|
|
return status;
|
|
}
|
|
|
|
/* We got access denied here. If we're already root,
|
|
or we didn't need to do a chown, or the fsp isn't
|
|
open with WRITE_OWNER access, just return. */
|
|
if (get_current_uid(handle->conn) == 0 || chown_needed == false ||
|
|
!(fsp->access_mask & SEC_STD_WRITE_OWNER)) {
|
|
return NT_STATUS_ACCESS_DENIED;
|
|
}
|
|
|
|
DBG_DEBUG("overriding chown on file %s for sid %s\n",
|
|
fsp_str_dbg(fsp), sid_string_tos(psd->owner_sid));
|
|
|
|
/* Ok, we failed to chown and we have
|
|
SEC_STD_WRITE_OWNER access - override. */
|
|
become_root();
|
|
status = SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp, security_info_sent, psd);
|
|
unbecome_root();
|
|
|
|
return status;
|
|
}
|
|
|
|
/*********************************************************************
|
|
Store a v3 security descriptor
|
|
*********************************************************************/
|
|
static NTSTATUS store_v3_blob(vfs_handle_struct *handle, files_struct *fsp,
|
|
struct security_descriptor *psd,
|
|
struct security_descriptor *pdesc_next,
|
|
uint8_t hash[XATTR_SD_HASH_SIZE])
|
|
{
|
|
NTSTATUS status;
|
|
DATA_BLOB blob;
|
|
|
|
if (DEBUGLEVEL >= 10) {
|
|
DBG_DEBUG("storing xattr sd for file %s\n",
|
|
fsp_str_dbg(fsp));
|
|
NDR_PRINT_DEBUG(
|
|
security_descriptor,
|
|
discard_const_p(struct security_descriptor, psd));
|
|
|
|
if (pdesc_next != NULL) {
|
|
DBG_DEBUG("storing xattr sd based on \n");
|
|
NDR_PRINT_DEBUG(
|
|
security_descriptor,
|
|
discard_const_p(struct security_descriptor,
|
|
pdesc_next));
|
|
} else {
|
|
DBG_DEBUG("ignoring underlying sd\n");
|
|
}
|
|
}
|
|
status = create_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DBG_DEBUG("create_acl_blob failed\n");
|
|
return status;
|
|
}
|
|
|
|
status = store_acl_blob_fsp(handle, fsp, &blob);
|
|
return status;
|
|
}
|
|
|
|
/*********************************************************************
|
|
Store a security descriptor given an fsp.
|
|
*********************************************************************/
|
|
|
|
static NTSTATUS fset_nt_acl_common(vfs_handle_struct *handle, files_struct *fsp,
|
|
uint32_t security_info_sent, const struct security_descriptor *orig_psd)
|
|
{
|
|
NTSTATUS status;
|
|
int ret;
|
|
DATA_BLOB blob, sys_acl_blob;
|
|
struct security_descriptor *pdesc_next = NULL;
|
|
struct security_descriptor *psd = NULL;
|
|
uint8_t hash[XATTR_SD_HASH_SIZE];
|
|
uint8_t sys_acl_hash[XATTR_SD_HASH_SIZE];
|
|
bool chown_needed = false;
|
|
char *sys_acl_description;
|
|
TALLOC_CTX *frame = talloc_stackframe();
|
|
bool ignore_file_system_acl = lp_parm_bool(
|
|
SNUM(handle->conn), ACL_MODULE_NAME, "ignore system acls", false);
|
|
|
|
if (DEBUGLEVEL >= 10) {
|
|
DBG_DEBUG("incoming sd for file %s\n", fsp_str_dbg(fsp));
|
|
NDR_PRINT_DEBUG(security_descriptor,
|
|
discard_const_p(struct security_descriptor, orig_psd));
|
|
}
|
|
|
|
status = get_nt_acl_internal(handle, fsp,
|
|
NULL,
|
|
SECINFO_OWNER|SECINFO_GROUP|SECINFO_DACL|SECINFO_SACL,
|
|
frame,
|
|
&psd);
|
|
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
TALLOC_FREE(frame);
|
|
return status;
|
|
}
|
|
|
|
psd->revision = orig_psd->revision;
|
|
/* All our SD's are self relative. */
|
|
psd->type = orig_psd->type | SEC_DESC_SELF_RELATIVE;
|
|
|
|
if ((security_info_sent & SECINFO_OWNER) && (orig_psd->owner_sid != NULL)) {
|
|
if (!dom_sid_equal(orig_psd->owner_sid, psd->owner_sid)) {
|
|
/* We're changing the owner. */
|
|
chown_needed = true;
|
|
}
|
|
psd->owner_sid = orig_psd->owner_sid;
|
|
}
|
|
if ((security_info_sent & SECINFO_GROUP) && (orig_psd->group_sid != NULL)) {
|
|
if (!dom_sid_equal(orig_psd->group_sid, psd->group_sid)) {
|
|
/* We're changing the group. */
|
|
chown_needed = true;
|
|
}
|
|
psd->group_sid = orig_psd->group_sid;
|
|
}
|
|
if (security_info_sent & SECINFO_DACL) {
|
|
if (security_descriptor_with_ms_nfs(orig_psd)) {
|
|
/*
|
|
* If the sd contains a MS NFS SID, do
|
|
* nothing, it's a chmod() request from OS X
|
|
* with AAPL context.
|
|
*/
|
|
TALLOC_FREE(frame);
|
|
return NT_STATUS_OK;
|
|
}
|
|
psd->dacl = orig_psd->dacl;
|
|
psd->type |= SEC_DESC_DACL_PRESENT;
|
|
}
|
|
if (security_info_sent & SECINFO_SACL) {
|
|
psd->sacl = orig_psd->sacl;
|
|
psd->type |= SEC_DESC_SACL_PRESENT;
|
|
}
|
|
|
|
if (ignore_file_system_acl) {
|
|
if (chown_needed) {
|
|
/* send only ownership stuff to lower layer */
|
|
security_info_sent &= (SECINFO_OWNER | SECINFO_GROUP);
|
|
status = set_underlying_acl(handle, fsp, psd,
|
|
security_info_sent, true);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
TALLOC_FREE(frame);
|
|
return status;
|
|
}
|
|
}
|
|
ZERO_ARRAY(hash);
|
|
status = store_v3_blob(handle, fsp, psd, NULL, hash);
|
|
|
|
TALLOC_FREE(frame);
|
|
return status;
|
|
}
|
|
|
|
status = set_underlying_acl(handle, fsp, psd, security_info_sent,
|
|
chown_needed);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
TALLOC_FREE(frame);
|
|
return status;
|
|
}
|
|
|
|
/* Get the full underlying sd, then hash. */
|
|
status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
|
|
fsp,
|
|
HASH_SECURITY_INFO,
|
|
frame,
|
|
&pdesc_next);
|
|
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
TALLOC_FREE(frame);
|
|
return status;
|
|
}
|
|
|
|
status = hash_sd_sha256(pdesc_next, hash);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
TALLOC_FREE(frame);
|
|
return status;
|
|
}
|
|
|
|
/* Get the full underlying sd, then hash. */
|
|
ret = SMB_VFS_NEXT_SYS_ACL_BLOB_GET_FD(handle,
|
|
fsp,
|
|
frame,
|
|
&sys_acl_description,
|
|
&sys_acl_blob);
|
|
|
|
/* If we fail to get the ACL blob (for some reason) then this
|
|
* is not fatal, we just work based on the NT ACL only */
|
|
if (ret != 0) {
|
|
status = store_v3_blob(handle, fsp, psd, pdesc_next, hash);
|
|
|
|
TALLOC_FREE(frame);
|
|
return status;
|
|
}
|
|
|
|
status = hash_blob_sha256(sys_acl_blob, sys_acl_hash);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
TALLOC_FREE(frame);
|
|
return status;
|
|
}
|
|
|
|
if (DEBUGLEVEL >= 10) {
|
|
DBG_DEBUG("storing xattr sd for file %s based on system ACL\n",
|
|
fsp_str_dbg(fsp));
|
|
NDR_PRINT_DEBUG(security_descriptor,
|
|
discard_const_p(struct security_descriptor, psd));
|
|
|
|
DBG_DEBUG("storing hash in xattr sd based on system ACL and:\n");
|
|
NDR_PRINT_DEBUG(security_descriptor,
|
|
discard_const_p(struct security_descriptor, pdesc_next));
|
|
}
|
|
|
|
/* We store hashes of both the sys ACL blob and the NT
|
|
* security desciptor mapped from that ACL so as to improve
|
|
* our chances against some inadvertant change breaking the
|
|
* hash used */
|
|
status = create_sys_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash,
|
|
sys_acl_description, sys_acl_hash);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
DBG_DEBUG("create_sys_acl_blob failed\n");
|
|
TALLOC_FREE(frame);
|
|
return status;
|
|
}
|
|
|
|
status = store_acl_blob_fsp(handle, fsp, &blob);
|
|
|
|
TALLOC_FREE(frame);
|
|
return status;
|
|
}
|
|
|
|
static int acl_common_remove_object(vfs_handle_struct *handle,
|
|
const struct smb_filename *smb_fname,
|
|
bool is_directory)
|
|
{
|
|
connection_struct *conn = handle->conn;
|
|
struct file_id id;
|
|
files_struct *fsp = NULL;
|
|
int ret = 0;
|
|
char *parent_dir = NULL;
|
|
const char *final_component = NULL;
|
|
struct smb_filename local_fname = {0};
|
|
struct smb_filename parent_dir_fname = {0};
|
|
int saved_errno = 0;
|
|
struct smb_filename *saved_dir_fname = NULL;
|
|
|
|
saved_dir_fname = vfs_GetWd(talloc_tos(),conn);
|
|
if (saved_dir_fname == NULL) {
|
|
saved_errno = errno;
|
|
goto out;
|
|
}
|
|
|
|
if (!parent_dirname(talloc_tos(), smb_fname->base_name,
|
|
&parent_dir, &final_component)) {
|
|
saved_errno = ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
DBG_DEBUG("removing %s %s/%s\n", is_directory ? "directory" : "file",
|
|
parent_dir, final_component);
|
|
|
|
parent_dir_fname = (struct smb_filename) { .base_name = parent_dir };
|
|
|
|
/* cd into the parent dir to pin it. */
|
|
ret = vfs_ChDir(conn, &parent_dir_fname);
|
|
if (ret == -1) {
|
|
saved_errno = errno;
|
|
goto out;
|
|
}
|
|
|
|
local_fname.base_name = discard_const_p(char, final_component);
|
|
|
|
/* Must use lstat here. */
|
|
ret = SMB_VFS_LSTAT(conn, &local_fname);
|
|
if (ret == -1) {
|
|
saved_errno = errno;
|
|
goto out;
|
|
}
|
|
|
|
/* Ensure we have this file open with DELETE access. */
|
|
id = vfs_file_id_from_sbuf(conn, &local_fname.st);
|
|
for (fsp = file_find_di_first(conn->sconn, id); fsp;
|
|
fsp = file_find_di_next(fsp)) {
|
|
if (fsp->access_mask & DELETE_ACCESS &&
|
|
fsp->delete_on_close) {
|
|
/* We did open this for delete,
|
|
* allow the delete as root.
|
|
*/
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!fsp) {
|
|
DBG_DEBUG("%s %s/%s not an open file\n",
|
|
is_directory ? "directory" : "file",
|
|
parent_dir, final_component);
|
|
saved_errno = EACCES;
|
|
goto out;
|
|
}
|
|
|
|
become_root();
|
|
if (is_directory) {
|
|
ret = SMB_VFS_NEXT_RMDIR(handle, &local_fname);
|
|
} else {
|
|
ret = SMB_VFS_NEXT_UNLINK(handle, &local_fname);
|
|
}
|
|
unbecome_root();
|
|
|
|
if (ret == -1) {
|
|
saved_errno = errno;
|
|
}
|
|
|
|
out:
|
|
|
|
TALLOC_FREE(parent_dir);
|
|
|
|
if (saved_dir_fname) {
|
|
vfs_ChDir(conn, saved_dir_fname);
|
|
TALLOC_FREE(saved_dir_fname);
|
|
}
|
|
if (saved_errno) {
|
|
errno = saved_errno;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int rmdir_acl_common(struct vfs_handle_struct *handle,
|
|
const struct smb_filename *smb_fname)
|
|
{
|
|
int ret;
|
|
|
|
/* Try the normal rmdir first. */
|
|
ret = SMB_VFS_NEXT_RMDIR(handle, smb_fname);
|
|
if (ret == 0) {
|
|
return 0;
|
|
}
|
|
if (errno == EACCES || errno == EPERM) {
|
|
/* Failed due to access denied,
|
|
see if we need to root override. */
|
|
return acl_common_remove_object(handle,
|
|
smb_fname,
|
|
true);
|
|
}
|
|
|
|
DBG_DEBUG("unlink of %s failed %s\n",
|
|
smb_fname->base_name,
|
|
strerror(errno));
|
|
return -1;
|
|
}
|
|
|
|
static int unlink_acl_common(struct vfs_handle_struct *handle,
|
|
const struct smb_filename *smb_fname)
|
|
{
|
|
int ret;
|
|
|
|
/* Try the normal unlink first. */
|
|
ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname);
|
|
if (ret == 0) {
|
|
return 0;
|
|
}
|
|
if (errno == EACCES || errno == EPERM) {
|
|
/* Failed due to access denied,
|
|
see if we need to root override. */
|
|
|
|
/* Don't do anything fancy for streams. */
|
|
if (smb_fname->stream_name) {
|
|
return -1;
|
|
}
|
|
return acl_common_remove_object(handle,
|
|
smb_fname,
|
|
false);
|
|
}
|
|
|
|
DBG_DEBUG("unlink of %s failed %s\n",
|
|
smb_fname->base_name,
|
|
strerror(errno));
|
|
return -1;
|
|
}
|
|
|
|
static int chmod_acl_module_common(struct vfs_handle_struct *handle,
|
|
const struct smb_filename *smb_fname,
|
|
mode_t mode)
|
|
{
|
|
if (smb_fname->flags & SMB_FILENAME_POSIX_PATH) {
|
|
/* Only allow this on POSIX pathnames. */
|
|
return SMB_VFS_NEXT_CHMOD(handle, smb_fname, mode);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int fchmod_acl_module_common(struct vfs_handle_struct *handle,
|
|
struct files_struct *fsp, mode_t mode)
|
|
{
|
|
if (fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) {
|
|
/* Only allow this on POSIX opens. */
|
|
return SMB_VFS_NEXT_FCHMOD(handle, fsp, mode);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int chmod_acl_acl_module_common(struct vfs_handle_struct *handle,
|
|
const struct smb_filename *smb_fname,
|
|
mode_t mode)
|
|
{
|
|
if (smb_fname->flags & SMB_FILENAME_POSIX_PATH) {
|
|
/* Only allow this on POSIX pathnames. */
|
|
return SMB_VFS_NEXT_CHMOD_ACL(handle, smb_fname, mode);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int fchmod_acl_acl_module_common(struct vfs_handle_struct *handle,
|
|
struct files_struct *fsp, mode_t mode)
|
|
{
|
|
if (fsp->posix_flags & FSP_POSIX_FLAGS_OPEN) {
|
|
/* Only allow this on POSIX opens. */
|
|
return SMB_VFS_NEXT_FCHMOD_ACL(handle, fsp, mode);
|
|
}
|
|
return 0;
|
|
}
|