/* Unix SMB/CIFS implementation. Set NT and POSIX ACLs and other VFS operations from Python Copyrigyt (C) Andrew Bartlett 2012 Copyright (C) Jeremy Allison 1994-2009. Copyright (C) Andreas Gruenbacher 2002. Copyright (C) Simo Sorce 2009. Copyright (C) Simo Sorce 2002 Copyright (C) Eric Lorimer 2002 This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . */ #include #include "includes.h" #include "python/py3compat.h" #include "smbd/smbd.h" #include "libcli/util/pyerrors.h" #include "librpc/rpc/pyrpc_util.h" #include #include "system/filesys.h" extern const struct generic_mapping file_generic_mapping; #undef DBGC_CLASS #define DBGC_CLASS DBGC_ACLS #ifdef O_DIRECTORY #define DIRECTORY_FLAGS O_RDONLY|O_DIRECTORY #else /* POSIX allows us to open a directory with O_RDONLY. */ #define DIRECTORY_FLAGS O_RDONLY #endif static connection_struct *get_conn_tos( const char *service, const struct auth_session_info *session_info) { struct conn_struct_tos *c = NULL; int snum = -1; NTSTATUS status; if (!posix_locking_init(false)) { PyErr_NoMemory(); return NULL; } if (service) { snum = lp_servicenumber(service); if (snum == -1) { PyErr_SetString(PyExc_RuntimeError, "unknown service"); return NULL; } } status = create_conn_struct_tos(NULL, snum, "/", session_info, &c); PyErr_NTSTATUS_IS_ERR_RAISE(status); /* Ignore read-only and share restrictions */ c->conn->read_only = false; c->conn->share_access = SEC_RIGHTS_FILE_ALL; return c->conn; } static int set_sys_acl_conn(const char *fname, SMB_ACL_TYPE_T acltype, SMB_ACL_T theacl, connection_struct *conn) { int ret; struct smb_filename *smb_fname = NULL; mode_t saved_umask; TALLOC_CTX *frame = talloc_stackframe(); /* we want total control over the permissions on created files, so set our umask to 0 */ saved_umask = umask(0); smb_fname = synthetic_smb_fname_split(frame, fname, lp_posix_pathnames()); if (smb_fname == NULL) { TALLOC_FREE(frame); umask(saved_umask); return -1; } ret = SMB_VFS_SYS_ACL_SET_FILE( conn, smb_fname, acltype, theacl); umask(saved_umask); TALLOC_FREE(frame); return ret; } static NTSTATUS init_files_struct(TALLOC_CTX *mem_ctx, const char *fname, struct connection_struct *conn, int flags, struct files_struct **_fsp) { struct smb_filename *smb_fname = NULL; int ret; mode_t saved_umask; struct files_struct *fsp; fsp = talloc_zero(mem_ctx, struct files_struct); if (fsp == NULL) { return NT_STATUS_NO_MEMORY; } fsp->fh = talloc(fsp, struct fd_handle); if (fsp->fh == NULL) { return NT_STATUS_NO_MEMORY; } fsp->conn = conn; /* we want total control over the permissions on created files, so set our umask to 0 */ saved_umask = umask(0); smb_fname = synthetic_smb_fname_split(fsp, fname, lp_posix_pathnames()); if (smb_fname == NULL) { umask(saved_umask); return NT_STATUS_NO_MEMORY; } fsp->fsp_name = smb_fname; fsp->fh->fd = SMB_VFS_OPEN(conn, smb_fname, fsp, flags, 00644); if (fsp->fh->fd == -1) { umask(saved_umask); return NT_STATUS_INVALID_PARAMETER; } ret = SMB_VFS_FSTAT(fsp, &smb_fname->st); if (ret == -1) { /* If we have an fd, this stat should succeed. */ DEBUG(0,("Error doing fstat on open file %s (%s)\n", smb_fname_str_dbg(smb_fname), strerror(errno) )); umask(saved_umask); return map_nt_error_from_unix(errno); } fsp->file_id = vfs_file_id_from_sbuf(conn, &smb_fname->st); fsp->vuid = UID_FIELD_INVALID; fsp->file_pid = 0; fsp->can_lock = True; fsp->can_read = True; fsp->can_write = True; fsp->print_file = NULL; fsp->modified = False; fsp->sent_oplock_break = NO_BREAK_SENT; fsp->is_directory = S_ISDIR(smb_fname->st.st_ex_mode); *_fsp = fsp; return NT_STATUS_OK; } static NTSTATUS set_nt_acl_conn(const char *fname, uint32_t security_info_sent, const struct security_descriptor *sd, connection_struct *conn) { TALLOC_CTX *frame = talloc_stackframe(); struct files_struct *fsp = NULL; NTSTATUS status = NT_STATUS_OK; /* first, try to open it as a file with flag O_RDWR */ status = init_files_struct(frame, fname, conn, O_RDWR, &fsp); if (!NT_STATUS_IS_OK(status) && errno == EISDIR) { /* if fail, try to open as dir */ status = init_files_struct(frame, fname, conn, DIRECTORY_FLAGS, &fsp); } if (!NT_STATUS_IS_OK(status)) { printf("open: error=%d (%s)\n", errno, strerror(errno)); SMB_VFS_CLOSE(fsp); TALLOC_FREE(frame); return status; } status = SMB_VFS_FSET_NT_ACL(fsp, security_info_sent, sd); if (!NT_STATUS_IS_OK(status)) { DEBUG(0,("set_nt_acl_no_snum: fset_nt_acl returned %s.\n", nt_errstr(status))); } SMB_VFS_CLOSE(fsp); TALLOC_FREE(frame); return status; } static NTSTATUS get_nt_acl_conn(TALLOC_CTX *mem_ctx, const char *fname, connection_struct *conn, uint32_t security_info_wanted, struct security_descriptor **sd) { TALLOC_CTX *frame = talloc_stackframe(); NTSTATUS status; struct smb_filename *smb_fname = synthetic_smb_fname(talloc_tos(), fname, NULL, NULL, lp_posix_pathnames() ? SMB_FILENAME_POSIX_PATH : 0); if (smb_fname == NULL) { TALLOC_FREE(frame); return NT_STATUS_NO_MEMORY; } status = SMB_VFS_GET_NT_ACL(conn, smb_fname, security_info_wanted, mem_ctx, sd); if (!NT_STATUS_IS_OK(status)) { DEBUG(0,("get_nt_acl_conn: get_nt_acl returned %s.\n", nt_errstr(status))); } TALLOC_FREE(frame); return status; } static int set_acl_entry_perms(SMB_ACL_ENTRY_T entry, mode_t perm_mask) { SMB_ACL_PERMSET_T perms = NULL; if (sys_acl_get_permset(entry, &perms) != 0) { return -1; } if (sys_acl_clear_perms(perms) != 0) { return -1; } if ((perm_mask & SMB_ACL_READ) != 0 && sys_acl_add_perm(perms, SMB_ACL_READ) != 0) { return -1; } if ((perm_mask & SMB_ACL_WRITE) != 0 && sys_acl_add_perm(perms, SMB_ACL_WRITE) != 0) { return -1; } if ((perm_mask & SMB_ACL_EXECUTE) != 0 && sys_acl_add_perm(perms, SMB_ACL_EXECUTE) != 0) { return -1; } if (sys_acl_set_permset(entry, perms) != 0) { return -1; } return 0; } static SMB_ACL_T make_simple_acl(TALLOC_CTX *mem_ctx, gid_t gid, mode_t chmod_mode) { mode_t mode = SMB_ACL_READ|SMB_ACL_WRITE|SMB_ACL_EXECUTE; mode_t mode_user = (chmod_mode & 0700) >> 6; mode_t mode_group = (chmod_mode & 070) >> 3; mode_t mode_other = chmod_mode & 07; SMB_ACL_ENTRY_T entry; SMB_ACL_T acl = sys_acl_init(mem_ctx); if (!acl) { return NULL; } if (sys_acl_create_entry(&acl, &entry) != 0) { TALLOC_FREE(acl); return NULL; } if (sys_acl_set_tag_type(entry, SMB_ACL_USER_OBJ) != 0) { TALLOC_FREE(acl); return NULL; } if (set_acl_entry_perms(entry, mode_user) != 0) { TALLOC_FREE(acl); return NULL; } if (sys_acl_create_entry(&acl, &entry) != 0) { TALLOC_FREE(acl); return NULL; } if (sys_acl_set_tag_type(entry, SMB_ACL_GROUP_OBJ) != 0) { TALLOC_FREE(acl); return NULL; } if (set_acl_entry_perms(entry, mode_group) != 0) { TALLOC_FREE(acl); return NULL; } if (sys_acl_create_entry(&acl, &entry) != 0) { TALLOC_FREE(acl); return NULL; } if (sys_acl_set_tag_type(entry, SMB_ACL_OTHER) != 0) { TALLOC_FREE(acl); return NULL; } if (set_acl_entry_perms(entry, mode_other) != 0) { TALLOC_FREE(acl); return NULL; } if (gid != -1) { if (sys_acl_create_entry(&acl, &entry) != 0) { TALLOC_FREE(acl); return NULL; } if (sys_acl_set_tag_type(entry, SMB_ACL_GROUP) != 0) { TALLOC_FREE(acl); return NULL; } if (sys_acl_set_qualifier(entry, &gid) != 0) { TALLOC_FREE(acl); return NULL; } if (set_acl_entry_perms(entry, mode_group) != 0) { TALLOC_FREE(acl); return NULL; } } if (sys_acl_create_entry(&acl, &entry) != 0) { TALLOC_FREE(acl); return NULL; } if (sys_acl_set_tag_type(entry, SMB_ACL_MASK) != 0) { TALLOC_FREE(acl); return NULL; } if (set_acl_entry_perms(entry, mode) != 0) { TALLOC_FREE(acl); return NULL; } return acl; } /* set a simple ACL on a file, as a test */ static PyObject *py_smbd_set_simple_acl(PyObject *self, PyObject *args, PyObject *kwargs) { const char * const kwnames[] = { "fname", "mode", "gid", "service", NULL }; char *fname, *service = NULL; int ret; int mode, gid = -1; SMB_ACL_T acl; TALLOC_CTX *frame; connection_struct *conn; if (!PyArg_ParseTupleAndKeywords(args, kwargs, "si|iz", discard_const_p(char *, kwnames), &fname, &mode, &gid, &service)) return NULL; frame = talloc_stackframe(); acl = make_simple_acl(frame, gid, mode); if (acl == NULL) { TALLOC_FREE(frame); return NULL; } conn = get_conn_tos(service, NULL); if (!conn) { TALLOC_FREE(frame); return NULL; } ret = set_sys_acl_conn(fname, SMB_ACL_TYPE_ACCESS, acl, conn); if (ret != 0) { TALLOC_FREE(frame); errno = ret; return PyErr_SetFromErrno(PyExc_OSError); } TALLOC_FREE(frame); Py_RETURN_NONE; } /* chown a file */ static PyObject *py_smbd_chown(PyObject *self, PyObject *args, PyObject *kwargs) { const char * const kwnames[] = { "fname", "uid", "gid", "service", NULL }; connection_struct *conn; int ret; char *fname, *service = NULL; int uid, gid; TALLOC_CTX *frame; mode_t saved_umask; struct smb_filename *smb_fname = NULL; if (!PyArg_ParseTupleAndKeywords(args, kwargs, "sii|z", discard_const_p(char *, kwnames), &fname, &uid, &gid, &service)) return NULL; frame = talloc_stackframe(); conn = get_conn_tos(service, NULL); if (!conn) { TALLOC_FREE(frame); return NULL; } /* we want total control over the permissions on created files, so set our umask to 0 */ saved_umask = umask(0); smb_fname = synthetic_smb_fname(talloc_tos(), fname, NULL, NULL, lp_posix_pathnames() ? SMB_FILENAME_POSIX_PATH : 0); if (smb_fname == NULL) { umask(saved_umask); TALLOC_FREE(frame); errno = ENOMEM; return PyErr_SetFromErrno(PyExc_OSError); } ret = SMB_VFS_CHOWN(conn, smb_fname, uid, gid); if (ret != 0) { umask(saved_umask); TALLOC_FREE(frame); errno = ret; return PyErr_SetFromErrno(PyExc_OSError); } umask(saved_umask); TALLOC_FREE(frame); Py_RETURN_NONE; } /* unlink a file */ static PyObject *py_smbd_unlink(PyObject *self, PyObject *args, PyObject *kwargs) { const char * const kwnames[] = { "fname", "service", NULL }; connection_struct *conn; int ret; struct smb_filename *smb_fname = NULL; char *fname, *service = NULL; TALLOC_CTX *frame; frame = talloc_stackframe(); if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s|z", discard_const_p(char *, kwnames), &fname, &service)) { TALLOC_FREE(frame); return NULL; } conn = get_conn_tos(service, NULL); if (!conn) { TALLOC_FREE(frame); return NULL; } smb_fname = synthetic_smb_fname_split(frame, fname, lp_posix_pathnames()); if (smb_fname == NULL) { TALLOC_FREE(frame); return PyErr_NoMemory(); } ret = SMB_VFS_UNLINK(conn, smb_fname); if (ret != 0) { TALLOC_FREE(frame); errno = ret; return PyErr_SetFromErrno(PyExc_OSError); } TALLOC_FREE(frame); Py_RETURN_NONE; } /* check if we have ACL support */ static PyObject *py_smbd_have_posix_acls(PyObject *self) { #ifdef HAVE_POSIX_ACLS return PyBool_FromLong(true); #else return PyBool_FromLong(false); #endif } /* set the NT ACL on a file */ static PyObject *py_smbd_set_nt_acl(PyObject *self, PyObject *args, PyObject *kwargs) { const char * const kwnames[] = { "fname", "security_info_sent", "sd", "service", "session_info", NULL }; NTSTATUS status; char *fname, *service = NULL; int security_info_sent; PyObject *py_sd; struct security_descriptor *sd; PyObject *py_session = Py_None; struct auth_session_info *session_info = NULL; connection_struct *conn; TALLOC_CTX *frame; frame = talloc_stackframe(); if (!PyArg_ParseTupleAndKeywords(args, kwargs, "siO|zO", discard_const_p(char *, kwnames), &fname, &security_info_sent, &py_sd, &service, &py_session)) { TALLOC_FREE(frame); return NULL; } if (!py_check_dcerpc_type(py_sd, "samba.dcerpc.security", "descriptor")) { TALLOC_FREE(frame); return NULL; } if (py_session != Py_None) { if (!py_check_dcerpc_type(py_session, "samba.dcerpc.auth", "session_info")) { TALLOC_FREE(frame); return NULL; } session_info = pytalloc_get_type(py_session, struct auth_session_info); if (!session_info) { PyErr_Format(PyExc_TypeError, "Expected auth_session_info for session_info argument got %s", talloc_get_name(pytalloc_get_ptr(py_session))); return NULL; } } conn = get_conn_tos(service, session_info); if (!conn) { TALLOC_FREE(frame); return NULL; } sd = pytalloc_get_type(py_sd, struct security_descriptor); status = set_nt_acl_conn(fname, security_info_sent, sd, conn); TALLOC_FREE(frame); PyErr_NTSTATUS_IS_ERR_RAISE(status); Py_RETURN_NONE; } /* Return the NT ACL on a file */ static PyObject *py_smbd_get_nt_acl(PyObject *self, PyObject *args, PyObject *kwargs) { const char * const kwnames[] = { "fname", "security_info_wanted", "service", NULL }; char *fname, *service = NULL; int security_info_wanted; PyObject *py_sd; struct security_descriptor *sd; TALLOC_CTX *frame = talloc_stackframe(); connection_struct *conn; NTSTATUS status; if (!PyArg_ParseTupleAndKeywords(args, kwargs, "si|z", discard_const_p(char *, kwnames), &fname, &security_info_wanted, &service)) { TALLOC_FREE(frame); return NULL; } conn = get_conn_tos(service, NULL); if (!conn) { TALLOC_FREE(frame); return NULL; } status = get_nt_acl_conn(frame, fname, conn, security_info_wanted, &sd); PyErr_NTSTATUS_IS_ERR_RAISE(status); py_sd = py_return_ndr_struct("samba.dcerpc.security", "descriptor", sd, sd); TALLOC_FREE(frame); return py_sd; } /* set the posix (or similar) ACL on a file */ static PyObject *py_smbd_set_sys_acl(PyObject *self, PyObject *args, PyObject *kwargs) { const char * const kwnames[] = { "fname", "acl_type", "acl", "service", NULL }; TALLOC_CTX *frame = talloc_stackframe(); int ret; char *fname, *service = NULL; PyObject *py_acl; struct smb_acl_t *acl; int acl_type; connection_struct *conn; if (!PyArg_ParseTupleAndKeywords(args, kwargs, "siO|z", discard_const_p(char *, kwnames), &fname, &acl_type, &py_acl, &service)) { TALLOC_FREE(frame); return NULL; } if (!py_check_dcerpc_type(py_acl, "samba.dcerpc.smb_acl", "t")) { TALLOC_FREE(frame); return NULL; } conn = get_conn_tos(service, NULL); if (!conn) { TALLOC_FREE(frame); return NULL; } acl = pytalloc_get_type(py_acl, struct smb_acl_t); ret = set_sys_acl_conn(fname, acl_type, acl, conn); if (ret != 0) { TALLOC_FREE(frame); errno = ret; return PyErr_SetFromErrno(PyExc_OSError); } TALLOC_FREE(frame); Py_RETURN_NONE; } /* Return the posix (or similar) ACL on a file */ static PyObject *py_smbd_get_sys_acl(PyObject *self, PyObject *args, PyObject *kwargs) { const char * const kwnames[] = { "fname", "acl_type", "service", NULL }; char *fname; PyObject *py_acl; struct smb_acl_t *acl; int acl_type; TALLOC_CTX *frame = talloc_stackframe(); connection_struct *conn; char *service = NULL; struct smb_filename *smb_fname = NULL; if (!PyArg_ParseTupleAndKeywords(args, kwargs, "si|z", discard_const_p(char *, kwnames), &fname, &acl_type, &service)) { TALLOC_FREE(frame); return NULL; } conn = get_conn_tos(service, NULL); if (!conn) { TALLOC_FREE(frame); return NULL; } smb_fname = synthetic_smb_fname_split(frame, fname, lp_posix_pathnames()); if (smb_fname == NULL) { TALLOC_FREE(frame); return NULL; } acl = SMB_VFS_SYS_ACL_GET_FILE( conn, smb_fname, acl_type, frame); if (!acl) { TALLOC_FREE(frame); return PyErr_SetFromErrno(PyExc_OSError); } py_acl = py_return_ndr_struct("samba.dcerpc.smb_acl", "t", acl, acl); TALLOC_FREE(frame); return py_acl; } static PyObject *py_smbd_mkdir(PyObject *self, PyObject *args, PyObject *kwargs) { const char * const kwnames[] = { "fname", "service", NULL }; char *fname, *service = NULL; TALLOC_CTX *frame = talloc_stackframe(); struct connection_struct *conn = NULL; struct smb_filename *smb_fname = NULL; if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s|z", discard_const_p(char *, kwnames), &fname, &service)) { TALLOC_FREE(frame); return NULL; } conn = get_conn_tos(service, NULL); if (!conn) { TALLOC_FREE(frame); return NULL; } smb_fname = synthetic_smb_fname(talloc_tos(), fname, NULL, NULL, lp_posix_pathnames() ? SMB_FILENAME_POSIX_PATH : 0); if (smb_fname == NULL) { TALLOC_FREE(frame); return NULL; } if (SMB_VFS_MKDIR(conn, smb_fname, 00755) == -1) { DBG_ERR("mkdir error=%d (%s)\n", errno, strerror(errno)); TALLOC_FREE(frame); return NULL; } TALLOC_FREE(frame); Py_RETURN_NONE; } /* Create an empty file */ static PyObject *py_smbd_create_file(PyObject *self, PyObject *args, PyObject *kwargs) { const char * const kwnames[] = { "fname", "service", NULL }; char *fname, *service = NULL; TALLOC_CTX *frame = talloc_stackframe(); struct connection_struct *conn = NULL; struct files_struct *fsp = NULL; NTSTATUS status; if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s|z", discard_const_p(char *, kwnames), &fname, &service)) { TALLOC_FREE(frame); return NULL; } conn = get_conn_tos(service, NULL); if (!conn) { TALLOC_FREE(frame); return NULL; } status = init_files_struct(frame, fname, conn, O_CREAT|O_EXCL|O_RDWR, &fsp); if (!NT_STATUS_IS_OK(status)) { DBG_ERR("init_files_struct failed: %s\n", nt_errstr(status)); } TALLOC_FREE(frame); Py_RETURN_NONE; } static PyMethodDef py_smbd_methods[] = { { "have_posix_acls", (PyCFunction)py_smbd_have_posix_acls, METH_NOARGS, NULL }, { "set_simple_acl", (PyCFunction)py_smbd_set_simple_acl, METH_VARARGS|METH_KEYWORDS, NULL }, { "set_nt_acl", (PyCFunction)py_smbd_set_nt_acl, METH_VARARGS|METH_KEYWORDS, NULL }, { "get_nt_acl", (PyCFunction)py_smbd_get_nt_acl, METH_VARARGS|METH_KEYWORDS, NULL }, { "get_sys_acl", (PyCFunction)py_smbd_get_sys_acl, METH_VARARGS|METH_KEYWORDS, NULL }, { "set_sys_acl", (PyCFunction)py_smbd_set_sys_acl, METH_VARARGS|METH_KEYWORDS, NULL }, { "chown", (PyCFunction)py_smbd_chown, METH_VARARGS|METH_KEYWORDS, NULL }, { "unlink", (PyCFunction)py_smbd_unlink, METH_VARARGS|METH_KEYWORDS, NULL }, { "mkdir", (PyCFunction)py_smbd_mkdir, METH_VARARGS|METH_KEYWORDS, NULL }, { "create_file", (PyCFunction)py_smbd_create_file, METH_VARARGS|METH_KEYWORDS, NULL }, { NULL } }; void initsmbd(void); static struct PyModuleDef moduledef = { PyModuleDef_HEAD_INIT, .m_name = "smbd", .m_doc = "Python bindings for the smbd file server.", .m_size = -1, .m_methods = py_smbd_methods, }; MODULE_INIT_FUNC(smbd) { PyObject *m = NULL; m = PyModule_Create(&moduledef); return m; }