Copyright 2012 Dan Walsh
systemd 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
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd 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.
+ Lesser General Public License for more details.
- You should have received a copy of the GNU General Public License
+ You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <limits.h>
#include <selinux/selinux.h>
#include <selinux/avc.h>
+#include <sys/socket.h>
#ifdef HAVE_AUDIT
#include <libaudit.h>
#endif
-#include <dbus.h>
+#include "sd-bus.h"
+#include "bus-util.h"
#include "util.h"
#include "log.h"
-#include "bus-errors.h"
-#include "dbus-common.h"
#include "audit.h"
#include "selinux-util.h"
#include "audit-fd.h"
};
static int bus_get_selinux_security_context(
- DBusConnection *connection,
+ sd_bus *bus,
const char *name,
- char **scon,
- DBusError *error) {
+ sd_bus_error *error,
+ char **ret) {
- _cleanup_dbus_message_unref_ DBusMessage *m = NULL, *reply = NULL;
- DBusMessageIter iter, sub;
- const char *bytes;
+ _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
+ const void *p;
+ size_t sz;
char *b;
- int nbytes;
-
- m = dbus_message_new_method_call(
- DBUS_SERVICE_DBUS,
- DBUS_PATH_DBUS,
- DBUS_INTERFACE_DBUS,
- "GetConnectionSELinuxSecurityContext");
- if (!m) {
- dbus_set_error_const(error, DBUS_ERROR_NO_MEMORY, NULL);
- return -ENOMEM;
- }
-
- if (!dbus_message_append_args(
- m,
- DBUS_TYPE_STRING, &name,
- DBUS_TYPE_INVALID)) {
- dbus_set_error_const(error, DBUS_ERROR_NO_MEMORY, NULL);
- return -ENOMEM;
- }
-
- reply = dbus_connection_send_with_reply_and_block(connection, m, -1, error);
- if (!reply)
- return -EIO;
-
- if (dbus_set_error_from_message(error, reply))
- return -EIO;
-
- if (!dbus_message_iter_init(reply, &iter))
- return -EIO;
+ int r;
- if (dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY)
- return -EIO;
+ assert(bus);
+ assert(name);
+ assert(ret);
+
+ r = sd_bus_call_method(
+ bus,
+ "org.freedesktop.DBus",
+ "/org/freedesktop/DBus",
+ "org.freedesktop.DBus",
+ "GetConnectionSELinuxSecurityContext",
+ error, &m,
+ "s", name);
+ if (r < 0)
+ return r;
- dbus_message_iter_recurse(&iter, &sub);
- dbus_message_iter_get_fixed_array(&sub, &bytes, &nbytes);
+ r = sd_bus_message_read_array(m, 'y', &p, &sz);
+ if (r < 0)
+ return r;
- b = strndup(bytes, nbytes);
+ b = strndup(p, sz);
if (!b)
return -ENOMEM;
- *scon = b;
-
- log_debug("GetConnectionSELinuxSecurityContext %s (pid %ld)", *scon, (long) bus_get_unix_process_id(connection, name, error));
-
+ *ret = b;
return 0;
}
static int bus_get_audit_data(
- DBusConnection *connection,
+ sd_bus *bus,
const char *name,
- struct auditstruct *audit,
- DBusError *error) {
+ struct auditstruct *audit) {
pid_t pid;
int r;
- pid = bus_get_unix_process_id(connection, name, error);
- if (pid <= 0)
- return -EIO;
+ assert(bus);
+ assert(name);
+ assert(audit);
+
+ r = sd_bus_get_owner_pid(bus, name, &pid);
+ if (r < 0)
+ return r;
r = audit_loginuid_from_pid(pid, &audit->loginuid);
if (r < 0)
if (r < 0)
return r;
- r = get_process_cmdline(pid, LINE_MAX, true, &audit->cmdline);
+ r = get_process_cmdline(pid, 0, true, &audit->cmdline);
if (r < 0)
return r;
user_avc's into the /var/log/audit/audit.log, otherwise they will be
sent to syslog.
*/
-static int log_callback(int type, const char *fmt, ...) {
+_printf_(2, 3) static int log_callback(int type, const char *fmt, ...) {
va_list ap;
va_start(ap, fmt);
#ifdef HAVE_AUDIT
if (get_audit_fd() >= 0) {
- char buf[LINE_MAX];
+ _cleanup_free_ char *buf = NULL;
+ int r;
- vsnprintf(buf, sizeof(buf), fmt, ap);
- audit_log_user_avc_message(get_audit_fd(), AUDIT_USER_AVC, buf, NULL, NULL, NULL, 0);
+ r = vasprintf(&buf, fmt, ap);
va_end(ap);
- return 0;
+ if (r >= 0) {
+ audit_log_user_avc_message(get_audit_fd(), AUDIT_USER_AVC, buf, NULL, NULL, NULL, 0);
+ return 0;
+ }
+
+ va_start(ap, fmt);
}
#endif
log_metav(LOG_USER | LOG_INFO, __FILE__, __LINE__, __FUNCTION__, fmt, ap);
If you want to cleanup memory you should need to call selinux_access_finish.
*/
static int access_init(void) {
- int r;
+ int r = 0;
if (avc_open(NULL, 0)) {
log_error("avc_open() failed: %m");
selinux_set_callback(SELINUX_CB_AUDIT, (union selinux_callback) audit_callback);
selinux_set_callback(SELINUX_CB_LOG, (union selinux_callback) log_callback);
- if (security_getenforce() >= 0)
- return 0;
-
- r = -errno;
- avc_destroy();
+ if (security_getenforce() < 0){
+ r = -errno;
+ avc_destroy();
+ }
return r;
}
-static int selinux_access_init(DBusError *error) {
+static int selinux_access_init(sd_bus_error *error) {
int r;
if (initialized)
return 0;
- if (use_selinux()) {
- r = access_init();
- if (r < 0) {
- dbus_set_error(error, DBUS_ERROR_ACCESS_DENIED, "Failed to initialize SELinux.");
- return r;
- }
- }
+ if (!use_selinux())
+ return 0;
+
+ r = access_init();
+ if (r < 0)
+ return sd_bus_error_set(error, SD_BUS_ERROR_ACCESS_DENIED, "Failed to initialize SELinux.");
initialized = true;
return 0;
}
void selinux_access_free(void) {
+
if (!initialized)
return;
}
static int get_audit_data(
- DBusConnection *connection,
- DBusMessage *message,
- struct auditstruct *audit,
- DBusError *error) {
+ sd_bus *bus,
+ sd_bus_message *message,
+ struct auditstruct *audit) {
- const char *sender;
- int r, fd;
struct ucred ucred;
+ const char *sender;
socklen_t len;
+ int r, fd;
- sender = dbus_message_get_sender(message);
+ sender = sd_bus_message_get_sender(message);
if (sender)
- return bus_get_audit_data(connection, sender, audit, error);
+ return bus_get_audit_data(bus, sender, audit);
- if (!dbus_connection_get_unix_fd(connection, &fd))
- return -EINVAL;
+ fd = sd_bus_get_fd(bus);
+ if (fd < 0)
+ return fd;
+ len = sizeof(ucred);
r = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &len);
- if (r < 0) {
- log_error("Failed to determine peer credentials: %m");
+ if (r < 0)
return -errno;
- }
audit->uid = ucred.uid;
audit->gid = ucred.gid;
if (r < 0)
return r;
- r = get_process_cmdline(ucred.pid, LINE_MAX, true, &audit->cmdline);
+ r = get_process_cmdline(ucred.pid, 0, true, &audit->cmdline);
if (r < 0)
return r;
connections. Whether it is on the bus or a local connection.
*/
static int get_calling_context(
- DBusConnection *connection,
- DBusMessage *message,
- security_context_t *scon,
- DBusError *error) {
+ sd_bus *bus,
+ sd_bus_message *message,
+ sd_bus_error *error,
+ security_context_t *ret) {
const char *sender;
- int r;
- int fd;
+ int r, fd;
/*
If sender exists then
if sender is NULL this indicates a local connection. Grab the fd
from dbus and do an getpeercon to peers process context
*/
- sender = dbus_message_get_sender(message);
- if (sender) {
- log_error("SELinux Got Sender %s", sender);
-
- r = bus_get_selinux_security_context(connection, sender, scon, error);
- if (r >= 0)
- return r;
-
- log_error("bus_get_selinux_security_context failed: %m");
- return r;
- }
+ sender = sd_bus_message_get_sender(message);
+ if (sender)
+ return bus_get_selinux_security_context(bus, sender, error, ret);
- log_debug("SELinux No Sender");
- if (!dbus_connection_get_unix_fd(connection, &fd)) {
- log_error("bus_connection_get_unix_fd failed %m");
- return -EINVAL;
- }
+ fd = sd_bus_get_fd(bus);
+ if (fd < 0)
+ return fd;
- r = getpeercon(fd, scon);
- if (r < 0) {
- log_error("getpeercon failed %m");
+ r = getpeercon(fd, ret);
+ if (r < 0)
return -errno;
- }
return 0;
}
If the machine is in permissive mode it will return ok. Audit messages will
still be generated if the access would be denied in enforcing mode.
*/
-int selinux_access_check(
- DBusConnection *connection,
- DBusMessage *message,
+int selinux_generic_access_check(
+ sd_bus *bus,
+ sd_bus_message *message,
const char *path,
const char *permission,
- DBusError *error) {
+ sd_bus_error *error) {
security_context_t scon = NULL, fcon = NULL;
- int r = 0;
const char *tclass = NULL;
struct auditstruct audit;
+ int r = 0;
- assert(connection);
+ assert(bus);
assert(message);
assert(permission);
assert(error);
if (r < 0)
return r;
- log_debug("SELinux access check for path=%s permission=%s", strna(path), permission);
-
audit.uid = audit.loginuid = (uid_t) -1;
audit.gid = (gid_t) -1;
audit.cmdline = NULL;
audit.path = path;
- r = get_calling_context(connection, message, &scon, error);
- if (r < 0) {
- log_error("Failed to get caller's security context on: %m");
+ r = get_calling_context(bus, message, error, &scon);
+ if (r < 0)
goto finish;
- }
if (path) {
- tclass = "service";
- /* get the file context of the unit file */
+ /* Get the file context of the unit file */
+
r = getfilecon(path, &fcon);
if (r < 0) {
- dbus_set_error(error, DBUS_ERROR_ACCESS_DENIED, "Failed to get file context on %s.", path);
- r = -errno;
- log_error("Failed to get security context on %s: %m",path);
+ r = sd_bus_error_setf(error, SD_BUS_ERROR_ACCESS_DENIED, "Failed to get file context on %s.", path);
goto finish;
}
+ tclass = "service";
} else {
- tclass = "system";
r = getcon(&fcon);
if (r < 0) {
- dbus_set_error(error, DBUS_ERROR_ACCESS_DENIED, "Failed to get current context.");
- r = -errno;
- log_error("Failed to get current process context on: %m");
+ r = sd_bus_error_setf(error, SD_BUS_ERROR_ACCESS_DENIED, "Failed to get current context.");
goto finish;
}
+
+ tclass = "system";
}
- (void) get_audit_data(connection, message, &audit, error);
+ get_audit_data(bus, message, &audit);
errno = 0;
r = selinux_check_access(scon, fcon, tclass, permission, &audit);
- if (r < 0) {
- dbus_set_error(error, DBUS_ERROR_ACCESS_DENIED, "SELinux policy denies access.");
- r = -errno;
- log_error("SELinux policy denies access.");
- }
+ if (r < 0)
+ r = sd_bus_error_setf(error, SD_BUS_ERROR_ACCESS_DENIED, "SELinux policy denies access.");
log_debug("SELinux access check scon=%s tcon=%s tclass=%s perm=%s path=%s cmdline=%s: %i", scon, fcon, tclass, permission, path, audit.cmdline, r);
freecon(fcon);
if (r && security_getenforce() != 1) {
- dbus_error_init(error);
+ sd_bus_error_free(error);
r = 0;
}
#else
-int selinux_access_check(
- DBusConnection *connection,
- DBusMessage *message,
+int selinux_generic_access_check(
+ sd_bus *bus,
+ sd_bus_message *message,
const char *path,
const char *permission,
- DBusError *error) {
+ sd_bus_error *error) {
return 0;
}
~ianmdlvl / elogind.git / blobdiff