*
* Copyright (C) Volker Lendecke, 2008
* Copyright (C) Jeremy Allison, 2009
+ * Copyright (C) Ralph Böhme, 2016
*
* 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
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
+#include "includes.h"
+#include "vfs_acl_common.h"
#include "smbd/smbd.h"
#include "system/filesys.h"
+#include "librpc/gen_ndr/ndr_xattr.h"
#include "../libcli/security/security.h"
#include "../librpc/gen_ndr/ndr_security.h"
#include "../lib/util/bitmap.h"
+#include "passdb/lookup_sid.h"
+
+#include <gnutls/gnutls.h>
+#include <gnutls/crypto.h>
static NTSTATUS create_acl_blob(const struct security_descriptor *psd,
DATA_BLOB *pblob,
uint16_t hash_type,
uint8_t hash[XATTR_SD_HASH_SIZE]);
-static NTSTATUS get_acl_blob(TALLOC_CTX *ctx,
- vfs_handle_struct *handle,
- files_struct *fsp,
- const char *name,
- DATA_BLOB *pblob);
-
-static NTSTATUS store_acl_blob_fsp(vfs_handle_struct *handle,
- files_struct *fsp,
- DATA_BLOB *pblob);
-
#define HASH_SECURITY_INFO (SECINFO_OWNER | \
SECINFO_GROUP | \
SECINFO_DACL | \
SECINFO_SACL)
+bool init_acl_common_config(vfs_handle_struct *handle,
+ const char *module_name)
+{
+ struct acl_common_config *config = NULL;
+ const struct enum_list *default_acl_style_list = NULL;
+
+ default_acl_style_list = get_default_acl_style_list();
+
+ config = talloc_zero(handle->conn, struct acl_common_config);
+ if (config == NULL) {
+ DBG_ERR("talloc_zero() failed\n");
+ errno = ENOMEM;
+ return false;
+ }
+
+ config->ignore_system_acls = lp_parm_bool(SNUM(handle->conn),
+ module_name,
+ "ignore system acls",
+ false);
+ config->default_acl_style = lp_parm_enum(SNUM(handle->conn),
+ module_name,
+ "default acl style",
+ default_acl_style_list,
+ DEFAULT_ACL_POSIX);
+
+ SMB_VFS_HANDLE_SET_DATA(handle, config, NULL,
+ struct acl_common_config,
+ return false);
+
+ return true;
+}
+
+
+/*******************************************************************
+ Hash a security descriptor.
+*******************************************************************/
+
+static NTSTATUS hash_blob_sha256(DATA_BLOB blob,
+ uint8_t *hash)
+{
+ int rc;
+
+ ZERO_ARRAY_LEN(hash, XATTR_SD_HASH_SIZE);
+
+ rc = gnutls_hash_fast(GNUTLS_DIG_SHA256,
+ blob.data,
+ blob.length,
+ hash);
+ if (rc < 0) {
+ return NT_STATUS_INTERNAL_ERROR;
+ }
+
+ return NT_STATUS_OK;
+}
+
/*******************************************************************
Hash a security descriptor.
*******************************************************************/
uint8_t *hash)
{
DATA_BLOB blob;
- SHA256_CTX tctx;
NTSTATUS status;
memset(hash, '\0', XATTR_SD_HASH_SIZE);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
-
- samba_SHA256_Init(&tctx);
- samba_SHA256_Update(&tctx, blob.data, blob.length);
- samba_SHA256_Final(hash, &tctx);
-
- return NT_STATUS_OK;
+ return hash_blob_sha256(blob, hash);
}
/*******************************************************************
*******************************************************************/
static NTSTATUS parse_acl_blob(const DATA_BLOB *pblob,
- struct security_descriptor **ppdesc,
- uint16_t *p_hash_type,
- uint8_t hash[XATTR_SD_HASH_SIZE])
+ TALLOC_CTX *mem_ctx,
+ struct security_descriptor **ppdesc,
+ uint16_t *p_hash_type,
+ uint16_t *p_version,
+ uint8_t hash[XATTR_SD_HASH_SIZE],
+ uint8_t sys_acl_hash[XATTR_SD_HASH_SIZE])
{
- TALLOC_CTX *ctx = talloc_tos();
struct xattr_NTACL xacl;
enum ndr_err_code ndr_err;
size_t sd_size;
+ TALLOC_CTX *frame = talloc_stackframe();
- ndr_err = ndr_pull_struct_blob(pblob, ctx, &xacl,
+ ndr_err = ndr_pull_struct_blob(pblob, frame, &xacl,
(ndr_pull_flags_fn_t)ndr_pull_xattr_NTACL);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
- DEBUG(5, ("parse_acl_blob: ndr_pull_xattr_NTACL failed: %s\n",
- ndr_errstr(ndr_err)));
+ DBG_INFO("ndr_pull_xattr_NTACL failed: %s\n",
+ ndr_errstr(ndr_err));
+ TALLOC_FREE(frame);
return ndr_map_error2ntstatus(ndr_err);
}
+ *p_version = xacl.version;
+
switch (xacl.version) {
case 1:
- *ppdesc = make_sec_desc(ctx, SD_REVISION,
+ *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
xacl.info.sd->type | SEC_DESC_SELF_RELATIVE,
xacl.info.sd->owner_sid,
xacl.info.sd->group_sid,
memset(hash, '\0', XATTR_SD_HASH_SIZE);
break;
case 2:
- *ppdesc = make_sec_desc(ctx, SD_REVISION,
+ *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
xacl.info.sd_hs2->sd->type | SEC_DESC_SELF_RELATIVE,
xacl.info.sd_hs2->sd->owner_sid,
xacl.info.sd_hs2->sd->group_sid,
memset(hash, '\0', XATTR_SD_HASH_SIZE);
break;
case 3:
- *ppdesc = make_sec_desc(ctx, SD_REVISION,
+ *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
xacl.info.sd_hs3->sd->type | SEC_DESC_SELF_RELATIVE,
xacl.info.sd_hs3->sd->owner_sid,
xacl.info.sd_hs3->sd->group_sid,
xacl.info.sd_hs3->sd->dacl,
&sd_size);
*p_hash_type = xacl.info.sd_hs3->hash_type;
- /* Current version 3. */
+ /* Current version 3 (if no sys acl hash available). */
memcpy(hash, xacl.info.sd_hs3->hash, XATTR_SD_HASH_SIZE);
break;
+ case 4:
+ *ppdesc = make_sec_desc(mem_ctx, SD_REVISION,
+ xacl.info.sd_hs4->sd->type | SEC_DESC_SELF_RELATIVE,
+ xacl.info.sd_hs4->sd->owner_sid,
+ xacl.info.sd_hs4->sd->group_sid,
+ xacl.info.sd_hs4->sd->sacl,
+ xacl.info.sd_hs4->sd->dacl,
+ &sd_size);
+ *p_hash_type = xacl.info.sd_hs4->hash_type;
+ /* Current version 4. */
+ memcpy(hash, xacl.info.sd_hs4->hash, XATTR_SD_HASH_SIZE);
+ memcpy(sys_acl_hash, xacl.info.sd_hs4->sys_acl_hash, XATTR_SD_HASH_SIZE);
+ break;
default:
+ TALLOC_FREE(frame);
return NT_STATUS_REVISION_MISMATCH;
}
- TALLOC_FREE(xacl.info.sd);
+ TALLOC_FREE(frame);
return (*ppdesc != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
}
/*******************************************************************
- Create a DATA_BLOB from a security descriptor.
+ Create a DATA_BLOB from a hash of the security descriptor storead at
+ the system layer and the NT ACL we wish to preserve
*******************************************************************/
static NTSTATUS create_acl_blob(const struct security_descriptor *psd,
(ndr_push_flags_fn_t)ndr_push_xattr_NTACL);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
- DEBUG(5, ("create_acl_blob: ndr_push_xattr_NTACL failed: %s\n",
- ndr_errstr(ndr_err)));
+ DBG_INFO("ndr_push_xattr_NTACL failed: %s\n",
+ ndr_errstr(ndr_err));
+ return ndr_map_error2ntstatus(ndr_err);
+ }
+
+ return NT_STATUS_OK;
+}
+
+/*******************************************************************
+ Create a DATA_BLOB from a hash of the security descriptors
+ (system and NT) stored at the system layer and the NT ACL we wish
+ to preserve.
+*******************************************************************/
+
+static NTSTATUS create_sys_acl_blob(const struct security_descriptor *psd,
+ DATA_BLOB *pblob,
+ uint16_t hash_type,
+ uint8_t hash[XATTR_SD_HASH_SIZE],
+ const char *description,
+ uint8_t sys_acl_hash[XATTR_SD_HASH_SIZE])
+{
+ struct xattr_NTACL xacl;
+ struct security_descriptor_hash_v4 sd_hs4;
+ enum ndr_err_code ndr_err;
+ TALLOC_CTX *ctx = talloc_tos();
+
+ ZERO_STRUCT(xacl);
+ ZERO_STRUCT(sd_hs4);
+
+ xacl.version = 4;
+ xacl.info.sd_hs4 = &sd_hs4;
+ xacl.info.sd_hs4->sd = discard_const_p(struct security_descriptor, psd);
+ xacl.info.sd_hs4->hash_type = hash_type;
+ memcpy(&xacl.info.sd_hs4->hash[0], hash, XATTR_SD_HASH_SIZE);
+ xacl.info.sd_hs4->description = description;
+ memcpy(&xacl.info.sd_hs4->sys_acl_hash[0], sys_acl_hash, XATTR_SD_HASH_SIZE);
+
+ ndr_err = ndr_push_struct_blob(
+ pblob, ctx, &xacl,
+ (ndr_push_flags_fn_t)ndr_push_xattr_NTACL);
+
+ if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+ DBG_INFO("ndr_push_xattr_NTACL failed: %s\n",
+ ndr_errstr(ndr_err));
return ndr_map_error2ntstatus(ndr_err);
}
mode_t dir_mode;
mode_t file_mode;
mode_t mode;
- struct security_ace *new_ace_list = talloc_zero_array(talloc_tos(),
- struct security_ace,
- num_aces + 3);
+ struct security_ace *new_ace_list;
+
+ if (psd->dacl) {
+ new_ace_list = talloc_zero_array(psd->dacl,
+ struct security_ace,
+ num_aces + 3);
+ } else {
+ /*
+ * make_sec_acl() at the bottom of this function
+ * duplicates new_ace_list
+ */
+ new_ace_list = talloc_zero_array(talloc_tos(),
+ struct security_ace,
+ num_aces + 3);
+ }
if (new_ace_list == NULL) {
return NT_STATUS_NO_MEMORY;
mode = dir_mode | file_mode;
- DEBUG(10, ("add_directory_inheritable_components: directory %s, "
- "mode = 0%o\n",
- name,
- (unsigned int)mode ));
+ DBG_DEBUG("directory %s, mode = 0%o\n", name, (unsigned int)mode);
if (num_aces) {
memcpy(new_ace_list, psd->dacl->aces,
if (psd->dacl) {
psd->dacl->aces = new_ace_list;
psd->dacl->num_aces += 3;
+ psd->dacl->size += new_ace_list[num_aces].size +
+ new_ace_list[num_aces+1].size +
+ new_ace_list[num_aces+2].size;
} else {
- psd->dacl = make_sec_acl(talloc_tos(),
+ psd->dacl = make_sec_acl(psd,
NT4_ACL_REVISION,
3,
new_ace_list);
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 char *name,
- uint32_t security_info,
- struct security_descriptor **ppdesc)
+/**
+ * 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 filesystem 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,
+ struct files_struct *fsp,
+ const struct smb_filename *smb_fname,
+ const DATA_BLOB *blob,
+ struct security_descriptor **ppsd,
+ bool *psd_is_from_fs)
{
- DATA_BLOB blob = data_blob_null;
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 *pdesc_next = NULL;
- bool ignore_file_system_acl = lp_parm_bool(SNUM(handle->conn),
- ACL_MODULE_NAME,
- "ignore system acls",
- false);
-
- if (fsp && name == NULL) {
- name = fsp->fsp_name->base_name;
+ 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;
}
- DEBUG(10, ("get_nt_acl_internal: name=%s\n", name));
+ /* determine which type of xattr we got */
+ switch (xattr_version) {
+ case 1:
+ case 2:
+ /* These xattr types are unilateral, 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;
+ }
- /* 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,
- &pdesc_next);
- } else {
- status = SMB_VFS_NEXT_GET_NT_ACL(handle,
- name,
- HASH_SECURITY_INFO,
- &pdesc_next);
+ 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;
}
- if (!NT_STATUS_IS_OK(status)) {
- DEBUG(10, ("get_nt_acl_internal: get_next_acl for file %s "
- "returned %s\n",
- name,
- nt_errstr(status)));
- return status;
+ /* 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;
}
- status = get_acl_blob(talloc_tos(), handle, fsp, name, &blob);
- if (!NT_STATUS_IS_OK(status)) {
- DEBUG(10, ("get_nt_acl_internal: get_acl_blob returned %s\n",
- nt_errstr(status)));
- psd = pdesc_next;
- goto out;
- }
+ /* determine which type of xattr we got */
+ switch (xattr_version) {
+ case 4:
+ {
+ int ret;
+ /* 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);
+ /* 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;
+ }
- status = parse_acl_blob(&blob, &psd,
- &hash_type, &hash[0]);
- if (!NT_STATUS_IS_OK(status)) {
- DEBUG(10, ("parse_acl_blob returned %s\n",
- nt_errstr(status)));
- psd = pdesc_next;
- goto out;
- }
+ TALLOC_FREE(sys_acl_blob_description);
+ TALLOC_FREE(sys_acl_blob.data);
- /* Ensure the hash type is one we know. */
- switch (hash_type) {
- case XATTR_SD_HASH_TYPE_NONE:
- /* No hash, just return blob sd. */
- goto out;
- case XATTR_SD_HASH_TYPE_SHA256:
- break;
- default:
- DEBUG(10, ("get_nt_acl_internal: ACL blob revision "
- "mismatch (%u) for file %s\n",
- (unsigned int)hash_type,
- name));
- TALLOC_FREE(psd);
- psd = pdesc_next;
- goto out;
- }
+ 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;
+ }
+ }
- if (ignore_file_system_acl) {
- goto out;
+ /* Otherwise, fall though and see if the NT ACL hash matches */
+ FALL_THROUGH;
}
+ case 3:
+ /* Get the full underlying sd for the hash
+ or to return as backup. */
+ status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
+ fsp,
+ 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(pdesc_next, hash_tmp);
- if (!NT_STATUS_IS_OK(status)) {
- TALLOC_FREE(psd);
- psd = pdesc_next;
- goto out;
- }
+ 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. */
- DEBUG(10, ("get_nt_acl_internal: blob hash "
- "matches for file %s\n",
- name ));
- goto out;
+ 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;
}
- /* Hash doesn't match, return underlying sd. */
+ return NT_STATUS_OK;
+
+fail:
TALLOC_FREE(psd);
- psd = pdesc_next;
+ TALLOC_FREE(psd_blob);
+ TALLOC_FREE(psd_fs);
+ TALLOC_FREE(sys_acl_blob_description);
+ TALLOC_FREE(sys_acl_blob.data);
+ return status;
+}
- out:
+/*******************************************************************
+ Pull a DATA_BLOB from an xattr given an fsp.
+ If the hash doesn't match, or doesn't exist - return the underlying
+ filesystem sd.
+*******************************************************************/
- if (psd != pdesc_next) {
- /* We're returning the blob, throw
- * away the filesystem SD. */
- TALLOC_FREE(pdesc_next);
- } else {
- 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.
- */
- if (fsp) {
+NTSTATUS fget_nt_acl_common(
+ NTSTATUS (*fget_acl_blob_fn)(TALLOC_CTX *ctx,
+ vfs_handle_struct *handle,
+ files_struct *fsp,
+ DATA_BLOB *pblob),
+ vfs_handle_struct *handle,
+ files_struct *fsp,
+ 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 = fsp->fsp_name;
+ 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);
+
+ DBG_DEBUG("name=%s\n", smb_fname->base_name);
+
+ status = fget_acl_blob_fn(mem_ctx, handle, fsp, &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) {
status = vfs_stat_fsp(fsp);
if (!NT_STATUS_IS_OK(status)) {
- return status;
+ goto fail;
+ }
+
+ status = make_default_filesystem_acl(
+ mem_ctx,
+ config->default_acl_style,
+ smb_fname->base_name,
+ &fsp->fsp_name->st,
+ &psd);
+ if (!NT_STATUS_IS_OK(status)) {
+ goto fail;
}
- psbuf = &fsp->fsp_name->st;
} else {
- int ret = vfs_stat_smb_fname(handle->conn,
- name,
- &sbuf);
- if (ret == -1) {
- return map_nt_error_from_unix(errno);
+ status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
+ fsp,
+ 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;
}
- is_directory = S_ISDIR(psbuf->st_ex_mode);
-
- if (ignore_file_system_acl) {
- TALLOC_FREE(pdesc_next);
- status = make_default_filesystem_acl(talloc_tos(),
- name,
- psbuf,
- &psd);
+ }
+
+ if (psd_is_from_fs) {
+ status = vfs_stat_fsp(fsp);
+ if (!NT_STATUS_IS_OK(status)) {
+ goto fail;
+ }
+
+ /*
+ * 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.
+ */
+
+ if (fsp->fsp_flags.is_directory &&
+ !sd_has_inheritable_components(psd, true)) {
+ status = add_directory_inheritable_components(
+ handle,
+ smb_fname->base_name,
+ &fsp->fsp_name->st,
+ psd);
if (!NT_STATUS_IS_OK(status)) {
- return status;
+ goto fail;
}
- } else {
- if (is_directory &&
- !sd_has_inheritable_components(psd,
- true)) {
- status = add_directory_inheritable_components(
- handle,
- name,
- psbuf,
- psd);
- if (!NT_STATUS_IS_OK(status)) {
- return status;
- }
- }
- /* 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;
}
+
+ /*
+ * 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->sacl = NULL;
}
- TALLOC_FREE(blob.data);
- *ppdesc = psd;
-
if (DEBUGLEVEL >= 10) {
- DEBUG(10,("get_nt_acl_internal: returning acl for %s is:\n",
- name ));
+ 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.
+ Set the underlying ACL (e.g. POSIX ACLS, POSIX owner, etc)
*********************************************************************/
-
-static NTSTATUS fget_nt_acl_common(vfs_handle_struct *handle, files_struct *fsp,
- uint32_t security_info, struct security_descriptor **ppdesc)
+static NTSTATUS set_underlying_acl(vfs_handle_struct *handle, files_struct *fsp,
+ struct security_descriptor *psd,
+ uint32_t security_info_sent,
+ bool chown_needed)
{
- return get_nt_acl_internal(handle, fsp,
- NULL, security_info, ppdesc);
+ NTSTATUS status;
+ const struct security_token *token = NULL;
+ struct dom_sid_buf buf;
+
+ 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) {
+ return NT_STATUS_ACCESS_DENIED;
+ }
+ status = check_any_access_fsp(fsp, SEC_STD_WRITE_OWNER);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
+
+ /*
+ * Only allow take-ownership, not give-ownership. That's the way Windows
+ * implements SEC_STD_WRITE_OWNER. MS-FSA 2.1.5.16 just states: If
+ * InputBuffer.OwnerSid is not a valid owner SID for a file in the
+ * objectstore, as determined in an implementation specific manner, the
+ * object store MUST return STATUS_INVALID_OWNER.
+ */
+ token = get_current_nttok(fsp->conn);
+ if (!security_token_is_sid(token, psd->owner_sid)) {
+ return NT_STATUS_INVALID_OWNER;
+ }
+
+ DBG_DEBUG("overriding chown on file %s for sid %s\n",
+ fsp_str_dbg(fsp),
+ dom_sid_str_buf(psd->owner_sid, &buf));
+
+ /* 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;
}
/*********************************************************************
- Fetch a security descriptor given a pathname.
+ Store a v3 security descriptor
*********************************************************************/
-
-static NTSTATUS get_nt_acl_common(vfs_handle_struct *handle,
- const char *name, uint32_t security_info, struct security_descriptor **ppdesc)
+static NTSTATUS store_v3_blob(
+ NTSTATUS (*store_acl_blob_fsp_fn)(vfs_handle_struct *handle,
+ files_struct *fsp,
+ DATA_BLOB *pblob),
+ vfs_handle_struct *handle, files_struct *fsp,
+ struct security_descriptor *psd,
+ struct security_descriptor *pdesc_next,
+ uint8_t hash[XATTR_SD_HASH_SIZE])
{
- return get_nt_acl_internal(handle, NULL,
- name, security_info, ppdesc);
+ 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_fn(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 fset_nt_acl_common(
+ NTSTATUS (*fget_acl_blob_fn)(TALLOC_CTX *ctx,
+ vfs_handle_struct *handle,
+ files_struct *fsp,
+ DATA_BLOB *pblob),
+ NTSTATUS (*store_acl_blob_fsp_fn)(vfs_handle_struct *handle,
+ files_struct *fsp,
+ DATA_BLOB *pblob),
+ const char *module_name,
+ vfs_handle_struct *handle, files_struct *fsp,
+ uint32_t security_info_sent,
+ const struct security_descriptor *orig_psd)
{
NTSTATUS status;
- DATA_BLOB blob;
+ 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), module_name, "ignore system acls", false);
+ struct acl_common_fsp_ext *ext = NULL;
if (DEBUGLEVEL >= 10) {
- DEBUG(10,("fset_nt_acl_xattr: incoming sd for file %s\n",
- fsp_str_dbg(fsp)));
+ 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,
+ status = fget_nt_acl_common(fget_acl_blob_fn, handle, fsp,
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_DACL) {
+ psd->type = orig_psd->type;
+ /* All our SD's are self relative. */
+ 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)) {
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;
}
psd->type |= SEC_DESC_SACL_PRESENT;
}
- status = SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp, security_info_sent, psd);
- if (!NT_STATUS_IS_OK(status)) {
- 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;
- }
+ ext = VFS_ADD_FSP_EXTENSION(handle,
+ fsp,
+ struct acl_common_fsp_ext,
+ NULL);
+ ext->setting_nt_acl = true;
- DEBUG(10,("fset_nt_acl_common: 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();
- if (!NT_STATUS_IS_OK(status)) {
- return status;
+ 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)) {
+ goto done;
+ }
}
+ ZERO_ARRAY(hash);
+ status = store_v3_blob(store_acl_blob_fsp_fn, handle, fsp, psd,
+ NULL, hash);
+ goto done;
+ }
+
+ status = set_underlying_acl(handle, fsp, psd, security_info_sent,
+ chown_needed);
+ if (!NT_STATUS_IS_OK(status)) {
+ goto done;
}
/* Get the full underlying sd, then hash. */
status = SMB_VFS_NEXT_FGET_NT_ACL(handle,
- fsp,
- HASH_SECURITY_INFO,
- &pdesc_next);
+ fsp,
+ HASH_SECURITY_INFO,
+ frame,
+ &pdesc_next);
if (!NT_STATUS_IS_OK(status)) {
- return status;
+ goto done;
}
status = hash_sd_sha256(pdesc_next, hash);
if (!NT_STATUS_IS_OK(status)) {
- return status;
+ goto done;
+ }
+
+ /* 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(store_acl_blob_fsp_fn, handle, fsp, psd,
+ pdesc_next, hash);
+
+ goto done;
+ }
+
+ status = hash_blob_sha256(sys_acl_blob, sys_acl_hash);
+ if (!NT_STATUS_IS_OK(status)) {
+ goto done;
}
if (DEBUGLEVEL >= 10) {
- DEBUG(10,("fset_nt_acl_xattr: storing xattr sd for file %s\n",
- fsp_str_dbg(fsp)));
+ 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, psd));
+ discard_const_p(struct security_descriptor, pdesc_next));
}
- create_acl_blob(psd, &blob, XATTR_SD_HASH_TYPE_SHA256, hash);
- store_acl_blob_fsp(handle, fsp, &blob);
- return NT_STATUS_OK;
+ /* We store hashes of both the sys ACL blob and the NT
+ * security descriptor mapped from that ACL so as to improve
+ * our chances against some inadvertent 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");
+ goto done;
+ }
+
+ status = store_acl_blob_fsp_fn(handle, fsp, &blob);
+
+done:
+ VFS_REMOVE_FSP_EXTENSION(handle, fsp);
+ TALLOC_FREE(frame);
+ return status;
}
static int acl_common_remove_object(vfs_handle_struct *handle,
- const char *path,
+ struct files_struct *dirfsp,
+ 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;
+ struct smb_filename *full_fname = NULL;
+ struct smb_filename *local_fname = NULL;
+ struct smb_filename *parent_dir_fname = NULL;
int saved_errno = 0;
- char *saved_dir = NULL;
+ struct smb_filename *saved_dir_fname = NULL;
+ NTSTATUS status;
- saved_dir = vfs_GetWd(talloc_tos(),conn);
- if (!saved_dir) {
+ saved_dir_fname = vfs_GetWd(talloc_tos(),conn);
+ if (saved_dir_fname == NULL) {
saved_errno = errno;
goto out;
}
- if (!parent_dirname(talloc_tos(), path,
- &parent_dir, &final_component)) {
- saved_errno = ENOMEM;
+ full_fname = full_path_from_dirfsp_atname(talloc_tos(),
+ dirfsp,
+ smb_fname);
+ if (full_fname == NULL) {
goto out;
}
- DEBUG(10,("acl_common_remove_object: removing %s %s/%s\n",
- is_directory ? "directory" : "file",
- parent_dir, final_component ));
+ status = SMB_VFS_PARENT_PATHNAME(conn,
+ talloc_tos(),
+ full_fname,
+ &parent_dir_fname,
+ &local_fname);
+ if (!NT_STATUS_IS_OK(status)) {
+ saved_errno = map_errno_from_nt_status(status);
+ goto out;
+ }
+
+ DBG_DEBUG("removing %s %s\n", is_directory ? "directory" : "file",
+ smb_fname_str_dbg(full_fname));
/* cd into the parent dir to pin it. */
- ret = vfs_ChDir(conn, parent_dir);
+ ret = vfs_ChDir(conn, parent_dir_fname);
if (ret == -1) {
saved_errno = errno;
goto out;
}
- ZERO_STRUCT(local_fname);
- local_fname.base_name = discard_const_p(char, final_component);
-
/* Must use lstat here. */
- ret = SMB_VFS_LSTAT(conn, &local_fname);
+ 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)) {
+ id = vfs_file_id_from_sbuf(conn, &local_fname->st);
+ for (fsp = file_find_di_first(conn->sconn, id, true); fsp;
+ fsp = file_find_di_next(fsp, true)) {
if (fsp->access_mask & DELETE_ACCESS &&
- fsp->delete_on_close) {
+ fsp->fsp_flags.delete_on_close)
+ {
/* We did open this for delete,
* allow the delete as root.
*/
}
if (!fsp) {
- DEBUG(10,("acl_common_remove_object: %s %s/%s "
- "not an open file\n",
- is_directory ? "directory" : "file",
- parent_dir, final_component ));
+ DBG_DEBUG("%s %s not an open file\n",
+ is_directory ? "directory" : "file",
+ smb_fname_str_dbg(full_fname));
saved_errno = EACCES;
goto out;
}
become_root();
if (is_directory) {
- ret = SMB_VFS_NEXT_RMDIR(handle, final_component);
+ ret = SMB_VFS_NEXT_UNLINKAT(handle,
+ dirfsp,
+ smb_fname,
+ AT_REMOVEDIR);
} else {
- ret = SMB_VFS_NEXT_UNLINK(handle, &local_fname);
+ ret = SMB_VFS_NEXT_UNLINKAT(handle,
+ dirfsp,
+ smb_fname,
+ 0);
}
unbecome_root();
out:
- TALLOC_FREE(parent_dir);
+ TALLOC_FREE(parent_dir_fname);
+ TALLOC_FREE(full_fname);
- if (saved_dir) {
- vfs_ChDir(conn, saved_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 char *path)
+int rmdir_acl_common(struct vfs_handle_struct *handle,
+ struct files_struct *dirfsp,
+ const struct smb_filename *smb_fname)
{
int ret;
/* Try the normal rmdir first. */
- ret = SMB_VFS_NEXT_RMDIR(handle, path);
+ ret = SMB_VFS_NEXT_UNLINKAT(handle,
+ dirfsp,
+ smb_fname,
+ AT_REMOVEDIR);
if (ret == 0) {
return 0;
}
/* Failed due to access denied,
see if we need to root override. */
return acl_common_remove_object(handle,
- path,
+ dirfsp,
+ smb_fname,
true);
}
- DEBUG(10,("rmdir_acl_common: unlink of %s failed %s\n",
- path,
- strerror(errno) ));
+ 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 unlink_acl_common(struct vfs_handle_struct *handle,
+ struct files_struct *dirfsp,
+ const struct smb_filename *smb_fname,
+ int flags)
{
int ret;
/* Try the normal unlink first. */
- ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname);
+ ret = SMB_VFS_NEXT_UNLINKAT(handle,
+ dirfsp,
+ smb_fname,
+ flags);
if (ret == 0) {
return 0;
}
return -1;
}
return acl_common_remove_object(handle,
- smb_fname->base_name,
+ dirfsp,
+ smb_fname,
false);
}
- DEBUG(10,("unlink_acl_common: unlink of %s failed %s\n",
- smb_fname->base_name,
- strerror(errno) ));
+ 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 char *path, mode_t mode)
-{
- if (lp_posix_pathnames()) {
- /* Only allow this on POSIX pathnames. */
- return SMB_VFS_NEXT_CHMOD(handle, path, mode);
- }
- return 0;
-}
-
-static int fchmod_acl_module_common(struct vfs_handle_struct *handle,
- struct files_struct *fsp, mode_t mode)
+int fchmod_acl_module_common(struct vfs_handle_struct *handle,
+ struct files_struct *fsp, mode_t mode)
{
- if (fsp->posix_open) {
+ if (fsp->posix_flags & FSP_POSIX_FLAGS_PATHNAMES
+ || fsp->fsp_name->flags & SMB_FILENAME_POSIX_PATH) {
/* 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 char *name, mode_t mode)
-{
- if (lp_posix_pathnames()) {
- /* Only allow this on POSIX pathnames. */
- return SMB_VFS_NEXT_CHMOD_ACL(handle, name, 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_open) {
- /* Only allow this on POSIX opens. */
- return SMB_VFS_NEXT_FCHMOD_ACL(handle, fsp, mode);
- }
- return 0;
-}
git.samba.org / samba.git / blobdiff