--- /dev/null
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
+/* dbus-credentials.c Credentials provable through authentication
+ *
+ * Copyright (C) 2007 Red Hat Inc.
+ *
+ * Licensed under the Academic Free License version 2.1
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+#include <config.h>
+#include <string.h>
+#include "dbus-credentials.h"
+#include "dbus-internals.h"
+
+/**
+ * @defgroup DBusCredentials Credentials provable through authentication
+ * @ingroup DBusInternals
+ * @brief DBusCredentials object
+ *
+ * Credentials are what you have to prove you have in order to
+ * authenticate. The main credentials right now are a unix user
+ * account, a Windows user account, or a UNIX process ID.
+ */
+
+/**
+ * @defgroup DBusCredentialsInternals Credentials implementation details
+ * @ingroup DBusInternals
+ * @brief DBusCredentials implementation details
+ *
+ * Private details of credentials code.
+ *
+ * @{
+ */
+
+struct DBusCredentials {
+ int refcount;
+ dbus_uid_t unix_uid;
+ dbus_pid_t unix_pid;
+ char *windows_sid;
+ void *adt_audit_data;
+ dbus_int32_t adt_audit_data_size;
+};
+
+/** @} */
+
+/**
+ * @addtogroup DBusCredentials
+ * @{
+ */
+
+/**
+ * Creates a new credentials object.
+ *
+ * @returns the new object or #NULL if no memory
+ */
+DBusCredentials*
+_dbus_credentials_new (void)
+{
+ DBusCredentials *creds;
+
+ creds = dbus_new (DBusCredentials, 1);
+ if (creds == NULL)
+ return NULL;
+
+ creds->refcount = 1;
+ creds->unix_uid = DBUS_UID_UNSET;
+ creds->unix_pid = DBUS_PID_UNSET;
+ creds->windows_sid = NULL;
+ creds->adt_audit_data = NULL;
+ creds->adt_audit_data_size = 0;
+
+ return creds;
+}
+
+/**
+ * Creates a new object with credentials (user ID and process ID) from the current process.
+ * @returns the new object or #NULL if no memory
+ */
+DBusCredentials*
+_dbus_credentials_new_from_current_process (void)
+{
+ DBusCredentials *creds;
+
+ creds = _dbus_credentials_new ();
+ if (creds == NULL)
+ return NULL;
+
+ if (!_dbus_credentials_add_from_current_process (creds))
+ {
+ _dbus_credentials_unref (creds);
+ return NULL;
+ }
+
+ return creds;
+}
+
+/**
+ * Increment refcount on credentials.
+ *
+ * @param credentials the object
+ */
+void
+_dbus_credentials_ref (DBusCredentials *credentials)
+{
+ _dbus_assert (credentials->refcount > 0);
+ credentials->refcount += 1;
+}
+
+/**
+ * Decrement refcount on credentials.
+ *
+ * @param credentials the object
+ */
+void
+_dbus_credentials_unref (DBusCredentials *credentials)
+{
+ _dbus_assert (credentials->refcount > 0);
+
+ credentials->refcount -= 1;
+ if (credentials->refcount == 0)
+ {
+ dbus_free (credentials->windows_sid);
+ dbus_free (credentials->adt_audit_data);
+ dbus_free (credentials);
+ }
+}
+
+/**
+ * Add a UNIX process ID to the credentials.
+ *
+ * @param credentials the object
+ * @param pid the process ID
+ * @returns #FALSE if no memory
+ */
+dbus_bool_t
+_dbus_credentials_add_unix_pid (DBusCredentials *credentials,
+ dbus_pid_t pid)
+{
+ credentials->unix_pid = pid;
+ return TRUE;
+}
+
+/**
+ * Add a UNIX user ID to the credentials.
+ *
+ * @param credentials the object
+ * @param uid the user ID
+ * @returns #FALSE if no memory
+ */
+dbus_bool_t
+_dbus_credentials_add_unix_uid(DBusCredentials *credentials,
+ dbus_uid_t uid)
+{
+ credentials->unix_uid = uid;
+ return TRUE;
+
+}
+
+/**
+ * Add a Windows user SID to the credentials.
+ *
+ * @param credentials the object
+ * @param windows_sid the user SID
+ * @returns #FALSE if no memory
+ */
+dbus_bool_t
+_dbus_credentials_add_windows_sid (DBusCredentials *credentials,
+ const char *windows_sid)
+{
+ char *copy;
+
+ copy = _dbus_strdup (windows_sid);
+ if (copy == NULL)
+ return FALSE;
+
+ dbus_free (credentials->windows_sid);
+ credentials->windows_sid = copy;
+
+ return TRUE;
+}
+
+/**
+ * Add ADT audit data to the credentials.
+ *
+ * @param credentials the object
+ * @param audit_data the audit data
+ * @param size the length of audit data
+ * @returns #FALSE if no memory
+ */
+dbus_bool_t
+_dbus_credentials_add_adt_audit_data (DBusCredentials *credentials,
+ void *audit_data,
+ dbus_int32_t size)
+{
+ void *copy;
+ copy = _dbus_memdup (audit_data, size);
+ if (copy == NULL)
+ return FALSE;
+
+ dbus_free (credentials->adt_audit_data);
+ credentials->adt_audit_data = copy;
+ credentials->adt_audit_data_size = size;
+
+ return TRUE;
+}
+
+/**
+ * Checks whether the given credential is present.
+ *
+ * @param credentials the object
+ * @param type the credential to check for
+ * @returns #TRUE if the credential is present
+ */
+dbus_bool_t
+_dbus_credentials_include (DBusCredentials *credentials,
+ DBusCredentialType type)
+{
+ switch (type)
+ {
+ case DBUS_CREDENTIAL_UNIX_PROCESS_ID:
+ return credentials->unix_pid != DBUS_PID_UNSET;
+ case DBUS_CREDENTIAL_UNIX_USER_ID:
+ return credentials->unix_uid != DBUS_UID_UNSET;
+ case DBUS_CREDENTIAL_WINDOWS_SID:
+ return credentials->windows_sid != NULL;
+ case DBUS_CREDENTIAL_ADT_AUDIT_DATA_ID:
+ return credentials->adt_audit_data != NULL;
+ }
+
+ _dbus_assert_not_reached ("Unknown credential enum value");
+ return FALSE;
+}
+
+/**
+ * Gets the UNIX process ID in the credentials, or #DBUS_PID_UNSET if
+ * the credentials object doesn't contain a process ID.
+ *
+ * @param credentials the object
+ * @returns UNIX process ID
+ */
+dbus_pid_t
+_dbus_credentials_get_unix_pid (DBusCredentials *credentials)
+{
+ return credentials->unix_pid;
+}
+
+/**
+ * Gets the UNIX user ID in the credentials, or #DBUS_UID_UNSET if
+ * the credentials object doesn't contain a user ID.
+ *
+ * @param credentials the object
+ * @returns UNIX user ID
+ */
+dbus_uid_t
+_dbus_credentials_get_unix_uid (DBusCredentials *credentials)
+{
+ return credentials->unix_uid;
+}
+
+/**
+ * Gets the Windows user SID in the credentials, or #NULL if
+ * the credentials object doesn't contain a Windows user SID.
+ *
+ * @param credentials the object
+ * @returns Windows user SID
+ */
+const char*
+_dbus_credentials_get_windows_sid (DBusCredentials *credentials)
+{
+ return credentials->windows_sid;
+}
+
+/**
+ * Gets the ADT audit data in the credentials, or #NULL if
+ * the credentials object doesn't contain ADT audit data.
+ *
+ * @param credentials the object
+ * @returns Solaris ADT audit data
+ */
+void *
+_dbus_credentials_get_adt_audit_data (DBusCredentials *credentials)
+{
+ return credentials->adt_audit_data;
+}
+
+/**
+ * Gets the ADT audit data size in the credentials, or 0 if
+ * the credentials object doesn't contain ADT audit data.
+ *
+ * @param credentials the object
+ * @returns Solaris ADT audit data size
+ */
+dbus_int32_t
+_dbus_credentials_get_adt_audit_data_size (DBusCredentials *credentials)
+{
+ return credentials->adt_audit_data_size;
+}
+
+/**
+ * Checks whether the first credentials object contains
+ * all the credentials found in the second credentials object.
+ *
+ * @param credentials the object
+ * @param possible_subset see if credentials in here are also in the first arg
+ * @returns #TRUE if second arg is contained in first
+ */
+dbus_bool_t
+_dbus_credentials_are_superset (DBusCredentials *credentials,
+ DBusCredentials *possible_subset)
+{
+ return
+ (possible_subset->unix_pid == DBUS_PID_UNSET ||
+ possible_subset->unix_pid == credentials->unix_pid) &&
+ (possible_subset->unix_uid == DBUS_UID_UNSET ||
+ possible_subset->unix_uid == credentials->unix_uid) &&
+ (possible_subset->windows_sid == NULL ||
+ (credentials->windows_sid && strcmp (possible_subset->windows_sid,
+ credentials->windows_sid) == 0)) &&
+ (possible_subset->adt_audit_data == NULL ||
+ (credentials->adt_audit_data && memcmp (possible_subset->adt_audit_data,
+ credentials->adt_audit_data,
+ credentials->adt_audit_data_size) == 0));
+}
+
+/**
+ * Checks whether a credentials object contains anything.
+ *
+ * @param credentials the object
+ * @returns #TRUE if there are no credentials in the object
+ */
+dbus_bool_t
+_dbus_credentials_are_empty (DBusCredentials *credentials)
+{
+ return
+ credentials->unix_pid == DBUS_PID_UNSET &&
+ credentials->unix_uid == DBUS_UID_UNSET &&
+ credentials->windows_sid == NULL &&
+ credentials->adt_audit_data == NULL;
+}
+
+/**
+ * Checks whether a credentials object contains a user identity.
+ *
+ * @param credentials the object
+ * @returns #TRUE if there are no user identities in the object
+ */
+dbus_bool_t
+_dbus_credentials_are_anonymous (DBusCredentials *credentials)
+{
+ return
+ credentials->unix_uid == DBUS_UID_UNSET &&
+ credentials->windows_sid == NULL;
+}
+
+/**
+ * Merge all credentials found in the second object into the first object,
+ * overwriting the first object if there are any overlaps.
+ *
+ * @param credentials the object
+ * @param other_credentials credentials to merge
+ * @returns #FALSE if no memory
+ */
+dbus_bool_t
+_dbus_credentials_add_credentials (DBusCredentials *credentials,
+ DBusCredentials *other_credentials)
+{
+ return
+ _dbus_credentials_add_credential (credentials,
+ DBUS_CREDENTIAL_UNIX_PROCESS_ID,
+ other_credentials) &&
+ _dbus_credentials_add_credential (credentials,
+ DBUS_CREDENTIAL_UNIX_USER_ID,
+ other_credentials) &&
+ _dbus_credentials_add_credential (credentials,
+ DBUS_CREDENTIAL_ADT_AUDIT_DATA_ID,
+ other_credentials) &&
+ _dbus_credentials_add_credential (credentials,
+ DBUS_CREDENTIAL_WINDOWS_SID,
+ other_credentials);
+}
+
+/**
+ * Merge the given credential found in the second object into the first object,
+ * overwriting the first object's value for that credential.
+ *
+ * Does nothing if the second object does not contain the specified credential.
+ * i.e., will never delete a credential from the first object.
+ *
+ * @param credentials the object
+ * @param which the credential to overwrite
+ * @param other_credentials credentials to merge
+ * @returns #FALSE if no memory
+ */
+dbus_bool_t
+_dbus_credentials_add_credential (DBusCredentials *credentials,
+ DBusCredentialType which,
+ DBusCredentials *other_credentials)
+{
+ if (which == DBUS_CREDENTIAL_UNIX_PROCESS_ID &&
+ other_credentials->unix_pid != DBUS_PID_UNSET)
+ {
+ if (!_dbus_credentials_add_unix_pid (credentials, other_credentials->unix_pid))
+ return FALSE;
+ }
+ else if (which == DBUS_CREDENTIAL_UNIX_USER_ID &&
+ other_credentials->unix_uid != DBUS_UID_UNSET)
+ {
+ if (!_dbus_credentials_add_unix_uid (credentials, other_credentials->unix_uid))
+ return FALSE;
+ }
+ else if (which == DBUS_CREDENTIAL_WINDOWS_SID &&
+ other_credentials->windows_sid != NULL)
+ {
+ if (!_dbus_credentials_add_windows_sid (credentials, other_credentials->windows_sid))
+ return FALSE;
+ }
+ else if (which == DBUS_CREDENTIAL_ADT_AUDIT_DATA_ID &&
+ other_credentials->adt_audit_data != NULL)
+ {
+ if (!_dbus_credentials_add_adt_audit_data (credentials, other_credentials->adt_audit_data, other_credentials->adt_audit_data_size))
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+/**
+ * Clear all credentials in the object.
+ *
+ * @param credentials the object
+ */
+void
+_dbus_credentials_clear (DBusCredentials *credentials)
+{
+ credentials->unix_pid = DBUS_PID_UNSET;
+ credentials->unix_uid = DBUS_UID_UNSET;
+ dbus_free (credentials->windows_sid);
+ credentials->windows_sid = NULL;
+ dbus_free (credentials->adt_audit_data);
+ credentials->adt_audit_data = NULL;
+ credentials->adt_audit_data_size = 0;
+}
+
+/**
+ * Copy a credentials object.
+ *
+ * @param credentials the object
+ * @returns the copy or #NULL
+ */
+DBusCredentials*
+_dbus_credentials_copy (DBusCredentials *credentials)
+{
+ DBusCredentials *copy;
+
+ copy = _dbus_credentials_new ();
+ if (copy == NULL)
+ return NULL;
+
+ if (!_dbus_credentials_add_credentials (copy, credentials))
+ {
+ _dbus_credentials_unref (copy);
+ return NULL;
+ }
+
+ return copy;
+}
+
+/**
+ * Check whether the user-identifying credentials in two credentials
+ * objects are identical. Credentials that are not related to the
+ * user are ignored, but any kind of user ID credentials must be the
+ * same (UNIX user ID, Windows user SID, etc.) and present in both
+ * objects for the function to return #TRUE.
+ *
+ * @param credentials the object
+ * @param other_credentials credentials to compare
+ * @returns #TRUE if the two credentials refer to the same user
+ */
+dbus_bool_t
+_dbus_credentials_same_user (DBusCredentials *credentials,
+ DBusCredentials *other_credentials)
+{
+ /* both windows and unix user must be the same (though pretty much
+ * in all conceivable cases, one will be unset)
+ */
+ return credentials->unix_uid == other_credentials->unix_uid &&
+ ((!(credentials->windows_sid || other_credentials->windows_sid)) ||
+ (credentials->windows_sid && other_credentials->windows_sid &&
+ strcmp (credentials->windows_sid, other_credentials->windows_sid) == 0));
+}
+
+/** @} */
+
+/* tests in dbus-credentials-util.c */
projects / monky / blobdiff