#include "strv.h"
#include "def.h"
#include "capability.h"
-#include "bus-policy.h"
+#include "bus-control.h"
+#include "smack-util.h"
+#include "set.h"
+#include "bus-xml-policy.h"
static char *arg_address = NULL;
static char *arg_command_line_buffer = NULL;
" --configuration=PATH Configuration file or directory\n"
" --machine=MACHINE Connect to specified machine\n"
" --address=ADDRESS Connect to the bus specified by ADDRESS\n"
- " (default: " DEFAULT_SYSTEM_BUS_PATH ")\n",
+ " (default: " DEFAULT_SYSTEM_BUS_ADDRESS ")\n",
program_invocation_short_name);
return 0;
return log_oom();
#ifdef ENABLE_KDBUS
- a = strjoin("x-container-kernel:machine=", e, ";x-container-unix:machine=", e, NULL);
+ a = strjoin("x-machine-kernel:machine=", e, ";x-machine-unix:machine=", e, NULL);
#else
- a = strjoin("x-container-unix:machine=", e, NULL);
+ a = strjoin("x-machine-unix:machine=", e, NULL);
#endif
if (!a)
return log_oom();
}
if (!arg_address) {
- arg_address = strdup(DEFAULT_SYSTEM_BUS_PATH);
+ arg_address = strdup(DEFAULT_SYSTEM_BUS_ADDRESS);
if (!arg_address)
return log_oom();
}
assert(a);
assert(b);
- r = sd_bus_get_owner_creds(b, SD_BUS_CREDS_UID|SD_BUS_CREDS_PID|SD_BUS_CREDS_CMDLINE|SD_BUS_CREDS_COMM, &creds);
+ r = sd_bus_get_owner_creds(b, SD_BUS_CREDS_UID|SD_BUS_CREDS_PID|SD_BUS_CREDS_CMDLINE|SD_BUS_CREDS_COMM|SD_BUS_CREDS_AUGMENT, &creds);
if (r < 0)
return r;
return sd_bus_send(b, n, NULL);
}
-static int process_policy(sd_bus *a, sd_bus *b, sd_bus_message *m) {
- _cleanup_bus_message_unref_ sd_bus_message *n = NULL;
- int r;
-
- assert(a);
- assert(b);
- assert(m);
-
- if (!a->is_kernel)
- return 0;
-
- if (!sd_bus_message_is_method_call(m, "org.freedesktop.DBus.Properties", "GetAll"))
- return 0;
-
- if (!streq_ptr(m->path, "/org/gnome/DisplayManager/Slave"))
- return 0;
-
- r = sd_bus_message_new_method_errorf(m, &n, SD_BUS_ERROR_ACCESS_DENIED, "gdm, you are stupid");
- if (r < 0)
- return r;
-
- r = bus_message_append_sender(n, "org.freedesktop.DBus");
- if (r < 0) {
- log_error("Failed to append sender to gdm reply: %s", strerror(-r));
- return r;
- }
-
- r = bus_seal_synthetic_message(b, n);
- if (r < 0) {
- log_error("Failed to seal gdm reply: %s", strerror(-r));
- return r;
- }
-
- r = sd_bus_send(b, n, NULL);
- if (r < 0) {
- log_error("Failed to send gdm reply: %s", strerror(-r));
- return r;
- }
-
- return 1;
-}
-
static int synthetic_driver_send(sd_bus *b, sd_bus_message *m) {
int r;
return synthetic_driver_send(call->bus, m);
}
+static int synthetic_reply_method_errorf(sd_bus_message *call, const char *name, const char *format, ...) {
+ _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+ va_list ap;
+
+ va_start(ap, format);
+ bus_error_setfv(&error, name, format, ap);
+ va_end(ap);
+
+ return synthetic_reply_method_error(call, &error);
+}
+
static int synthetic_reply_method_errno(sd_bus_message *call, int error, const sd_bus_error *p) {
_cleanup_bus_error_free_ sd_bus_error berror = SD_BUS_ERROR_NULL;
assert(call);
+ if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
+ return 0;
+
r = sd_bus_message_new_method_return(call, &m);
if (r < 0)
return synthetic_reply_method_errno(call, r, NULL);
assert(name);
assert(_creds);
- assert_return(service_name_is_valid(name), -EINVAL);
-
r = sd_bus_get_name_creds(bus, name, mask, &c);
if (r == -ESRCH || r == -ENXIO)
return sd_bus_error_setf(error, SD_BUS_ERROR_NAME_HAS_NO_OWNER, "Name %s is currently not owned by anyone.", name);
return get_creds_by_name(bus, name, mask, _creds, error);
}
-static int peer_is_privileged(sd_bus *bus, sd_bus_message *m) {
- _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
- uid_t uid;
- int r;
-
- r = get_creds_by_message(bus, m, SD_BUS_CREDS_UID, &creds, NULL);
- if (r < 0)
- return r;
-
- r = sd_bus_creds_get_uid(creds, &uid);
- if (r < 0)
- return r;
-
- r = sd_bus_creds_has_effective_cap(creds, CAP_SYS_ADMIN);
- if (r > 0)
- return true;
-
- if (uid == getuid())
- return true;
-
- return false;
-}
-
-static int process_driver(sd_bus *a, sd_bus *b, sd_bus_message *m) {
+static int process_driver(sd_bus *a, sd_bus *b, sd_bus_message *m, Policy *policy, const struct ucred *ucred, Set *owned_names) {
int r;
assert(a);
if (!streq_ptr(sd_bus_message_get_destination(m), "org.freedesktop.DBus"))
return 0;
+ /* The "Hello()" call is is handled in process_hello() */
+
if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus.Introspectable", "Introspect")) {
- if (0 && !isempty(sd_bus_message_get_signature(m, true))) {
- _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
- r = sd_bus_error_setf(&error, SD_BUS_ERROR_INVALID_ARGS, "Expected no parameters");
-
- return synthetic_reply_method_errno(m, r, &error);
- }
+ if (!sd_bus_message_has_signature(m, ""))
+ return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters"));
return synthetic_reply_method_return(m, "s",
"<!DOCTYPE node PUBLIC \"-//freedesktop//DTD D-BUS Object Introspection 1.0//EN\" "
} else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "AddMatch")) {
const char *match;
+ if (!sd_bus_message_has_signature(m, "s"))
+ return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters"));
+
r = sd_bus_message_read(m, "s", &match);
if (r < 0)
return synthetic_reply_method_errno(m, r, NULL);
} else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "RemoveMatch")) {
const char *match;
+ if (!sd_bus_message_has_signature(m, "s"))
+ return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters"));
+
r = sd_bus_message_read(m, "s", &match);
if (r < 0)
return synthetic_reply_method_errno(m, r, NULL);
_cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+ if (!sd_bus_message_has_signature(m, "s"))
+ return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters"));
+
r = get_creds_by_message(a, m, SD_BUS_CREDS_SELINUX_CONTEXT, &creds, &error);
if (r < 0)
return synthetic_reply_method_errno(m, r, &error);
_cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+ if (!sd_bus_message_has_signature(m, "s"))
+ return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters"));
+
r = get_creds_by_message(a, m, SD_BUS_CREDS_PID, &creds, &error);
if (r < 0)
return synthetic_reply_method_errno(m, r, &error);
_cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+ if (!sd_bus_message_has_signature(m, "s"))
+ return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters"));
+
r = get_creds_by_message(a, m, SD_BUS_CREDS_UID, &creds, &error);
if (r < 0)
return synthetic_reply_method_errno(m, r, &error);
sd_id128_t server_id;
char buf[SD_ID128_STRING_MAX];
- r = sd_bus_get_server_id(a, &server_id);
+ if (!sd_bus_message_has_signature(m, ""))
+ return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters"));
+
+ r = sd_bus_get_bus_id(a, &server_id);
if (r < 0)
return synthetic_reply_method_errno(m, r, NULL);
_cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+ if (!sd_bus_message_has_signature(m, "s"))
+ return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters"));
+
r = sd_bus_message_read(m, "s", &name);
if (r < 0)
return synthetic_reply_method_errno(m, r, NULL);
return synthetic_reply_method_return(m, "s", creds->unique_name);
- /* "Hello" is handled in process_hello() */
-
} else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "ListActivatableNames")) {
_cleanup_strv_free_ char **names = NULL;
+ if (!sd_bus_message_has_signature(m, ""))
+ return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters"));
+
r = sd_bus_list_names(a, NULL, &names);
if (r < 0)
return synthetic_reply_method_errno(m, r, NULL);
} else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "ListNames")) {
_cleanup_strv_free_ char **names = NULL;
+ if (!sd_bus_message_has_signature(m, ""))
+ return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters"));
+
r = sd_bus_list_names(a, &names, NULL);
if (r < 0)
return synthetic_reply_method_errno(m, r, NULL);
} else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "ListQueuedOwners")) {
struct kdbus_cmd_name_list cmd = {};
struct kdbus_name_list *name_list;
- struct kdbus_cmd_free cmd_free;
struct kdbus_name_info *name;
_cleanup_strv_free_ char **owners = NULL;
_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
char *arg0;
int err = 0;
+ if (!sd_bus_message_has_signature(m, "s"))
+ return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters"));
+
r = sd_bus_message_read(m, "s", &arg0);
if (r < 0)
return synthetic_reply_method_errno(m, r, NULL);
- if (!service_name_is_valid(arg0))
- return synthetic_reply_method_errno(m, -EINVAL, NULL);
-
r = sd_bus_get_name_creds(a, arg0, 0, NULL);
if (r == -ESRCH || r == -ENXIO) {
sd_bus_error_setf(&error, SD_BUS_ERROR_NAME_HAS_NO_OWNER, "Could not get owners of name '%s': no such name.", arg0);
}
}
- cmd_free.flags = 0;
- cmd_free.offset = cmd.offset;
-
- r = ioctl(a->input_fd, KDBUS_CMD_FREE, &cmd_free);
+ r = bus_kernel_cmd_free(a, cmd.offset);
if (r < 0)
return synthetic_reply_method_errno(m, r, NULL);
} else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "NameHasOwner")) {
const char *name;
+ if (!sd_bus_message_has_signature(m, "s"))
+ return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters"));
+
r = sd_bus_message_read(m, "s", &name);
if (r < 0)
return synthetic_reply_method_errno(m, r, NULL);
- if (!service_name_is_valid(name))
- return synthetic_reply_method_errno(m, -EINVAL, NULL);
-
if (streq(name, "org.freedesktop.DBus"))
return synthetic_reply_method_return(m, "b", true);
} else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "ReleaseName")) {
const char *name;
+ if (!sd_bus_message_has_signature(m, "s"))
+ return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters"));
+
r = sd_bus_message_read(m, "s", &name);
if (r < 0)
return synthetic_reply_method_errno(m, r, NULL);
- if (!service_name_is_valid(name))
- return synthetic_reply_method_errno(m, -EINVAL, NULL);
-
r = sd_bus_release_name(a, name);
if (r < 0) {
if (r == -ESRCH)
return synthetic_reply_method_errno(m, r, NULL);
}
+ set_remove(owned_names, (char*) name);
+
return synthetic_reply_method_return(m, "u", BUS_NAME_RELEASED);
} else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "ReloadConfig")) {
_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+ if (!sd_bus_message_has_signature(m, ""))
+ return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters"));
+
r = sd_bus_error_setf(&error, SD_BUS_ERROR_NOT_SUPPORTED, "%s() is not supported", sd_bus_message_get_member(m));
return synthetic_reply_method_errno(m, r, &error);
} else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "RequestName")) {
const char *name;
uint32_t flags, param;
+ bool in_queue;
+
+ if (!sd_bus_message_has_signature(m, "su"))
+ return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters"));
r = sd_bus_message_read(m, "su", &name, &flags);
if (r < 0)
return synthetic_reply_method_errno(m, r, NULL);
- if (!service_name_is_valid(name))
- return synthetic_reply_method_errno(m, -EINVAL, NULL);
+ if (policy && !policy_check_own(policy, ucred->uid, ucred->gid, name))
+ return synthetic_reply_method_errno(m, -EPERM, NULL);
+
if ((flags & ~(BUS_NAME_ALLOW_REPLACEMENT|BUS_NAME_REPLACE_EXISTING|BUS_NAME_DO_NOT_QUEUE)) != 0)
return synthetic_reply_method_errno(m, -EINVAL, NULL);
if (!(flags & BUS_NAME_DO_NOT_QUEUE))
param |= SD_BUS_NAME_QUEUE;
+ r = set_put_strdup(owned_names, name);
+ if (r < 0)
+ return synthetic_reply_method_errno(m, r, NULL);
+
r = sd_bus_request_name(a, name, param);
if (r < 0) {
- if (r == -EEXIST)
- return synthetic_reply_method_return(m, "u", BUS_NAME_EXISTS);
if (r == -EALREADY)
return synthetic_reply_method_return(m, "u", BUS_NAME_ALREADY_OWNER);
+
+ set_remove(owned_names, (char*) name);
+
+ if (r == -EEXIST)
+ return synthetic_reply_method_return(m, "u", BUS_NAME_EXISTS);
return synthetic_reply_method_errno(m, r, NULL);
}
- if (r == 0)
+ in_queue = (r == 0);
+
+ if (in_queue)
return synthetic_reply_method_return(m, "u", BUS_NAME_IN_QUEUE);
return synthetic_reply_method_return(m, "u", BUS_NAME_PRIMARY_OWNER);
const char *name;
uint32_t flags;
+ if (!sd_bus_message_has_signature(m, "su"))
+ return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters"));
+
r = sd_bus_message_read(m, "su", &name, &flags);
if (r < 0)
return synthetic_reply_method_errno(m, r, NULL);
- if (!service_name_is_valid(name))
- return synthetic_reply_method_errno(m, -EINVAL, NULL);
if (flags != 0)
return synthetic_reply_method_errno(m, -EINVAL, NULL);
_cleanup_bus_message_unref_ sd_bus_message *msg = NULL;
_cleanup_strv_free_ char **args = NULL;
- if (!peer_is_privileged(a, m))
- return synthetic_reply_method_errno(m, -EPERM, NULL);
+ if (!sd_bus_message_has_signature(m, "a{ss}"))
+ return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INVALID_ARGS, "Invalid parameters"));
r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "{ss}");
if (r < 0)
}
}
+static int handle_policy_error(sd_bus_message *m, int r) {
+ if (r == -ESRCH || r == -ENXIO)
+ return synthetic_reply_method_errorf(m, SD_BUS_ERROR_NAME_HAS_NO_OWNER, "Name %s is currently not owned by anyone.", m->destination);
+
+ return r;
+}
+
+static int process_policy(sd_bus *from, sd_bus *to, sd_bus_message *m, Policy *policy, const struct ucred *our_ucred, Set *owned_names) {
+ int r;
+
+ assert(from);
+ assert(to);
+ assert(m);
+
+ if (!policy)
+ return 0;
+
+ if (from->is_kernel) {
+ uid_t sender_uid = UID_INVALID;
+ gid_t sender_gid = GID_INVALID;
+ char **sender_names = NULL;
+ bool granted = false;
+
+ /* Driver messages are always OK */
+ if (streq_ptr(m->sender, "org.freedesktop.DBus"))
+ return 0;
+
+ /* The message came from the kernel, and is sent to our legacy client. */
+ sd_bus_creds_get_well_known_names(&m->creds, &sender_names);
+
+ (void) sd_bus_creds_get_uid(&m->creds, &sender_uid);
+ (void) sd_bus_creds_get_gid(&m->creds, &sender_gid);
+
+ /* First check whether the sender can send the message to our name */
+ if (set_isempty(owned_names)) {
+ if (policy_check_send(policy, sender_uid, sender_gid, m->header->type, NULL, m->path, m->interface, m->member))
+ granted = true;
+ } else {
+ Iterator i;
+ char *n;
+
+ SET_FOREACH(n, owned_names, i)
+ if (policy_check_send(policy, sender_uid, sender_gid, m->header->type, n, m->path, m->interface, m->member)) {
+ granted = true;
+ break;
+ }
+ }
+
+ if (granted) {
+ /* Then check whether us (the recipient) can receive from the sender's name */
+ if (strv_isempty(sender_names)) {
+ if (policy_check_recv(policy, our_ucred->uid, our_ucred->gid, m->header->type, NULL, m->path, m->interface, m->member))
+ return 0;
+ } else {
+ char **n;
+
+ STRV_FOREACH(n, sender_names) {
+ if (policy_check_recv(policy, our_ucred->uid, our_ucred->gid, m->header->type, *n, m->path, m->interface, m->member))
+ return 0;
+ }
+ }
+ }
+
+ /* Return an error back to the caller */
+ if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
+ return synthetic_reply_method_errorf(m, SD_BUS_ERROR_ACCESS_DENIED, "Access prohibited by XML receiver policy.");
+
+ /* Return 1, indicating that the message shall not be processed any further */
+ return 1;
+ }
+
+ if (to->is_kernel) {
+ _cleanup_bus_creds_unref_ sd_bus_creds *destination_creds = NULL;
+ uid_t destination_uid = UID_INVALID;
+ gid_t destination_gid = GID_INVALID;
+ const char *destination_unique = NULL;
+ char **destination_names = NULL;
+ bool granted = false;
+
+ /* Driver messages are always OK */
+ if (streq_ptr(m->destination, "org.freedesktop.DBus"))
+ return 0;
+
+ /* The message came from the legacy client, and is sent to kdbus. */
+ if (m->destination) {
+ r = bus_get_name_creds_kdbus(to, m->destination,
+ SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_UNIQUE_NAME|
+ SD_BUS_CREDS_UID|SD_BUS_CREDS_GID|SD_BUS_CREDS_PID,
+ true, &destination_creds);
+ if (r < 0)
+ return handle_policy_error(m, r);
+
+ r = sd_bus_creds_get_unique_name(destination_creds, &destination_unique);
+ if (r < 0)
+ return handle_policy_error(m, r);
+
+ sd_bus_creds_get_well_known_names(destination_creds, &destination_names);
+
+ (void) sd_bus_creds_get_uid(destination_creds, &destination_uid);
+ (void) sd_bus_creds_get_gid(destination_creds, &destination_gid);
+ }
+
+ /* First check if we (the sender) can send to this name */
+ if (strv_isempty(destination_names)) {
+ if (policy_check_send(policy, our_ucred->uid, our_ucred->gid, m->header->type, NULL, m->path, m->interface, m->member))
+ granted = true;
+ } else {
+ char **n;
+
+ STRV_FOREACH(n, destination_names) {
+ if (policy_check_send(policy, our_ucred->uid, our_ucred->gid, m->header->type, *n, m->path, m->interface, m->member)) {
+
+ /* If we made a receiver decision,
+ then remember which name's policy
+ we used, and to which unique ID it
+ mapped when we made the
+ decision. Then, let's pass this to
+ the kernel when sending the
+ message, so that it refuses the
+ operation should the name and
+ unique ID not map to each other
+ anymore. */
+
+ r = free_and_strdup(&m->destination_ptr, *n);
+ if (r < 0)
+ return r;
+
+ r = bus_kernel_parse_unique_name(destination_unique, &m->verify_destination_id);
+ if (r < 0)
+ break;
+
+ granted = true;
+ break;
+ }
+ }
+ }
+
+ /* Then check if the recipient can receive from our name */
+ if (granted) {
+ if (set_isempty(owned_names)) {
+ if (policy_check_recv(policy, destination_uid, destination_gid, m->header->type, NULL, m->path, m->interface, m->member))
+ return 0;
+ } else {
+ Iterator i;
+ char *n;
+
+ SET_FOREACH(n, owned_names, i)
+ if (policy_check_recv(policy, destination_uid, destination_gid, m->header->type, n, m->path, m->interface, m->member))
+ return 0;
+ }
+ }
+
+ /* Return an error back to the caller */
+ if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
+ return synthetic_reply_method_errorf(m, SD_BUS_ERROR_ACCESS_DENIED, "Access prohibited by XML sender policy.");
+
+ /* Return 1, indicating that the message shall not be processed any further */
+ return 1;
+ }
+
+ return 0;
+}
+
static int process_hello(sd_bus *a, sd_bus *b, sd_bus_message *m, bool *got_hello) {
_cleanup_bus_message_unref_ sd_bus_message *n = NULL;
bool is_hello;
return 0;
r = sd_bus_message_new_method_return(m, &n);
- if (r < 0) {
- log_error("Failed to generate HELLO reply: %s", strerror(-r));
- return r;
- }
+ if (r < 0)
+ return log_error_errno(r, "Failed to generate HELLO reply: %m");
r = sd_bus_message_append(n, "s", a->unique_name);
- if (r < 0) {
- log_error("Failed to append unique name to HELLO reply: %s", strerror(-r));
- return r;
- }
+ if (r < 0)
+ return log_error_errno(r, "Failed to append unique name to HELLO reply: %m");
r = bus_message_append_sender(n, "org.freedesktop.DBus");
- if (r < 0) {
- log_error("Failed to append sender to HELLO reply: %s", strerror(-r));
- return r;
- }
+ if (r < 0)
+ return log_error_errno(r, "Failed to append sender to HELLO reply: %m");
r = bus_seal_synthetic_message(b, n);
- if (r < 0) {
- log_error("Failed to seal HELLO reply: %s", strerror(-r));
- return r;
- }
+ if (r < 0)
+ return log_error_errno(r, "Failed to seal HELLO reply: %m");
r = sd_bus_send(b, n, NULL);
- if (r < 0) {
- log_error("Failed to send HELLO reply: %s", strerror(-r));
- return r;
- }
+ if (r < 0)
+ return log_error_errno(r, "Failed to send HELLO reply: %m");
n = sd_bus_message_unref(n);
r = sd_bus_message_new_signal(
"/org/freedesktop/DBus",
"org.freedesktop.DBus",
"NameAcquired");
- if (r < 0) {
- log_error("Failed to allocate initial NameAcquired message: %s", strerror(-r));
- return r;
- }
+ if (r < 0)
+ return log_error_errno(r, "Failed to allocate initial NameAcquired message: %m");
r = sd_bus_message_append(n, "s", a->unique_name);
- if (r < 0) {
- log_error("Failed to append unique name to NameAcquired message: %s", strerror(-r));
- return r;
- }
+ if (r < 0)
+ return log_error_errno(r, "Failed to append unique name to NameAcquired message: %m");
r = bus_message_append_sender(n, "org.freedesktop.DBus");
- if (r < 0) {
- log_error("Failed to append sender to NameAcquired message: %s", strerror(-r));
- return r;
- }
+ if (r < 0)
+ return log_error_errno(r, "Failed to append sender to NameAcquired message: %m");
r = bus_seal_synthetic_message(b, n);
- if (r < 0) {
- log_error("Failed to seal NameAcquired message: %s", strerror(-r));
- return r;
- }
+ if (r < 0)
+ return log_error_errno(r, "Failed to seal NameAcquired message: %m");
r = sd_bus_send(b, n, NULL);
- if (r < 0) {
- log_error("Failed to send NameAcquired message: %s", strerror(-r));
- return r;
- }
+ if (r < 0)
+ return log_error_errno(r, "Failed to send NameAcquired message: %m");
return 1;
}
return 0;
}
+static int mac_smack_apply_label_and_drop_cap_mac_admin(pid_t its_pid, const char *new_label) {
+#ifdef HAVE_SMACK
+ int r = 0, k;
+
+ if (!mac_smack_use())
+ return 0;
+
+ if (new_label && its_pid > 0)
+ r = mac_smack_apply_pid(its_pid, new_label);
+
+ k = drop_capability(CAP_MAC_ADMIN);
+ return r < 0 ? r : k;
+#else
+ return 0;
+#endif
+}
+
int main(int argc, char *argv[]) {
_cleanup_bus_close_unref_ sd_bus *a = NULL, *b = NULL;
bool is_unix;
struct ucred ucred = {};
_cleanup_free_ char *peersec = NULL;
- Policy policy = {};
+ Policy policy_buffer = {}, *policy = NULL;
+ _cleanup_set_free_free_ Set *owned_names = NULL;
+ uid_t original_uid;
log_set_target(LOG_TARGET_JOURNAL_OR_KMSG);
log_parse_environment();
if (r <= 0)
goto finish;
- r = policy_load(&policy, arg_configuration);
- if (r < 0) {
- log_error("Failed to load policy: %s", strerror(-r));
- goto finish;
- }
-
- /* policy_dump(&policy); */
-
r = sd_listen_fds(0);
if (r == 0) {
in_fd = STDIN_FILENO;
goto finish;
}
+ original_uid = getuid();
+
is_unix =
sd_is_socket(in_fd, AF_UNIX, 0, 0) > 0 &&
sd_is_socket(out_fd, AF_UNIX, 0, 0) > 0;
if (is_unix) {
(void) getpeercred(in_fd, &ucred);
(void) getpeersec(in_fd, &peersec);
+
+ r = mac_smack_apply_label_and_drop_cap_mac_admin(getpid(), peersec);
+ if (r < 0)
+ log_warning_errno(r, "Failed to set SMACK label (%s) and drop CAP_MAC_ADMIN: %m", peersec);
}
if (arg_drop_privileges) {
r = get_user_creds(&user, &uid, &gid, NULL, NULL);
if (r < 0) {
- log_error("Cannot resolve user name %s: %s", user, strerror(-r));
+ log_error_errno(r, "Cannot resolve user name %s: %m", user);
goto finish;
}
goto finish;
}
+ owned_names = set_new(&string_hash_ops);
+ if (!owned_names) {
+ log_oom();
+ goto finish;
+ }
+
r = sd_bus_new(&a);
if (r < 0) {
- log_error("Failed to allocate bus: %s", strerror(-r));
+ log_error_errno(r, "Failed to allocate bus: %m");
goto finish;
}
- r = sd_bus_set_name(a, "sd-proxy");
+ r = sd_bus_set_description(a, "sd-proxy");
if (r < 0) {
- log_error("Failed to set bus name: %s", strerror(-r));
+ log_error_errno(r, "Failed to set bus name: %m");
goto finish;
}
r = sd_bus_set_address(a, arg_address);
if (r < 0) {
- log_error("Failed to set address to connect to: %s", strerror(-r));
+ log_error_errno(r, "Failed to set address to connect to: %m");
goto finish;
}
r = sd_bus_negotiate_fds(a, is_unix);
if (r < 0) {
- log_error("Failed to set FD negotiation: %s", strerror(-r));
+ log_error_errno(r, "Failed to set FD negotiation: %m");
+ goto finish;
+ }
+
+ r = sd_bus_negotiate_creds(a, true, SD_BUS_CREDS_UID|SD_BUS_CREDS_PID|SD_BUS_CREDS_GID|SD_BUS_CREDS_SELINUX_CONTEXT);
+ if (r < 0) {
+ log_error_errno(r, "Failed to set credential negotiation: %m");
goto finish;
}
if (ucred.pid > 0) {
- a->fake_creds.pid = ucred.pid;
+ a->fake_pids.pid = ucred.pid;
+ a->fake_pids_valid = true;
+
a->fake_creds.uid = ucred.uid;
+ a->fake_creds.euid = UID_INVALID;
+ a->fake_creds.suid = UID_INVALID;
+ a->fake_creds.fsuid = UID_INVALID;
a->fake_creds.gid = ucred.gid;
+ a->fake_creds.egid = GID_INVALID;
+ a->fake_creds.sgid = GID_INVALID;
+ a->fake_creds.fsgid = GID_INVALID;
a->fake_creds_valid = true;
}
r = sd_bus_start(a);
if (r < 0) {
- log_error("Failed to start bus client: %s", strerror(-r));
+ log_error_errno(r, "Failed to start bus client: %m");
goto finish;
}
- r = sd_bus_get_server_id(a, &server_id);
+ r = sd_bus_get_bus_id(a, &server_id);
if (r < 0) {
- log_error("Failed to get server ID: %s", strerror(-r));
+ log_error_errno(r, "Failed to get server ID: %m");
goto finish;
}
+ if (a->is_kernel) {
+ if (!arg_configuration) {
+ const char *scope;
+
+ r = sd_bus_get_scope(a, &scope);
+ if (r < 0) {
+ log_error_errno(r, "Couldn't determine bus scope: %m");
+ goto finish;
+ }
+
+ if (streq(scope, "system"))
+ arg_configuration = strv_new(
+ "/etc/dbus-1/system.conf",
+ "/etc/dbus-1/system.d/",
+ "/etc/dbus-1/system-local.conf",
+ NULL);
+ else if (streq(scope, "user"))
+ arg_configuration = strv_new(
+ "/etc/dbus-1/session.conf",
+ "/etc/dbus-1/session.d/",
+ "/etc/dbus-1/session-local.conf",
+ NULL);
+ else {
+ log_error("Unknown scope %s, don't know which policy to load. Refusing.", scope);
+ goto finish;
+ }
+
+ if (!arg_configuration) {
+ r = log_oom();
+ goto finish;
+ }
+ }
+
+ r = policy_load(&policy_buffer, arg_configuration);
+ if (r < 0) {
+ log_error_errno(r, "Failed to load policy: %m");
+ goto finish;
+ }
+
+ policy = &policy_buffer;
+ /* policy_dump(policy); */
+
+ if (ucred.uid == original_uid)
+ log_debug("Permitting access, since bus owner matches bus client.");
+ else if (policy_check_hello(policy, ucred.uid, ucred.gid))
+ log_debug("Permitting access due to XML policy.");
+ else {
+ r = log_error_errno(EPERM, "Policy denied connection.");
+ goto finish;
+ }
+ }
+
r = sd_bus_new(&b);
if (r < 0) {
- log_error("Failed to allocate bus: %s", strerror(-r));
+ log_error_errno(r, "Failed to allocate bus: %m");
goto finish;
}
r = sd_bus_set_fd(b, in_fd, out_fd);
if (r < 0) {
- log_error("Failed to set fds: %s", strerror(-r));
+ log_error_errno(r, "Failed to set fds: %m");
goto finish;
}
r = sd_bus_set_server(b, 1, server_id);
if (r < 0) {
- log_error("Failed to set server mode: %s", strerror(-r));
+ log_error_errno(r, "Failed to set server mode: %m");
goto finish;
}
r = sd_bus_negotiate_fds(b, is_unix);
if (r < 0) {
- log_error("Failed to set FD negotiation: %s", strerror(-r));
+ log_error_errno(r, "Failed to set FD negotiation: %m");
+ goto finish;
+ }
+
+ r = sd_bus_negotiate_creds(b, true, SD_BUS_CREDS_UID|SD_BUS_CREDS_PID|SD_BUS_CREDS_GID|SD_BUS_CREDS_SELINUX_CONTEXT);
+ if (r < 0) {
+ log_error_errno(r, "Failed to set credential negotiation: %m");
goto finish;
}
r = sd_bus_set_anonymous(b, true);
if (r < 0) {
- log_error("Failed to set anonymous authentication: %s", strerror(-r));
+ log_error_errno(r, "Failed to set anonymous authentication: %m");
goto finish;
}
r = sd_bus_start(b);
if (r < 0) {
- log_error("Failed to start bus client: %s", strerror(-r));
+ log_error_errno(r, "Failed to start bus client: %m");
goto finish;
}
r = rename_service(a, b);
if (r < 0)
- log_debug("Failed to rename process: %s", strerror(-r));
+ log_debug_errno(r, "Failed to rename process: %m");
if (a->is_kernel) {
_cleanup_free_ char *match = NULL;
r = sd_bus_get_unique_name(a, &unique);
if (r < 0) {
- log_error("Failed to get unique name: %s", strerror(-r));
+ log_error_errno(r, "Failed to get unique name: %m");
goto finish;
}
r = sd_bus_add_match(a, NULL, match, NULL, NULL);
if (r < 0) {
- log_error("Failed to add match for NameLost: %s", strerror(-r));
+ log_error_errno(r, "Failed to add match for NameLost: %m");
goto finish;
}
r = sd_bus_add_match(a, NULL, match, NULL, NULL);
if (r < 0) {
- log_error("Failed to add match for NameAcquired: %s", strerror(-r));
+ log_error_errno(r, "Failed to add match for NameAcquired: %m");
goto finish;
}
}
int k;
if (got_hello) {
+ /* Read messages from bus, to pass them on to our client */
+
r = sd_bus_process(a, &m);
if (r < 0) {
/* treat 'connection reset by peer' as clean exit condition */
if (r == -ECONNRESET)
r = 0;
else
- log_error("Failed to process bus a: %s", strerror(-r));
+ log_error_errno(r, "Failed to process bus a: %m");
goto finish;
}
if (m) {
+ bool processed = false;
+
/* We officially got EOF, let's quit */
if (sd_bus_message_is_signal(m, "org.freedesktop.DBus.Local", "Disconnected")) {
r = 0;
k = synthesize_name_acquired(a, b, m);
if (k < 0) {
r = k;
- log_error("Failed to synthesize message: %s", strerror(-r));
+ log_error_errno(r, "Failed to synthesize message: %m");
goto finish;
}
patch_sender(a, m);
- k = sd_bus_send(b, m, NULL);
- if (k < 0) {
- if (k == -ECONNRESET)
- r = 0;
- else {
+ if (policy) {
+ k = process_policy(a, b, m, policy, &ucred, owned_names);
+ if (k < 0) {
r = k;
- log_error("Failed to send message: %s", strerror(-r));
+ log_error_errno(r, "Failed to process policy: %m");
+ goto finish;
+ } else if (k > 0) {
+ r = 1;
+ processed = true;
}
+ }
- goto finish;
+ if (!processed) {
+ k = sd_bus_send(b, m, NULL);
+ if (k < 0) {
+ if (k == -ECONNRESET) {
+ r = 0;
+ goto finish;
+ } else if (k == -EPERM && m->reply_cookie > 0) {
+ /* If the peer tries to send a reply and it is rejected with EPERM
+ * by the kernel, we ignore the error. This catches cases where the
+ * original method-call didn't had EXPECT_REPLY set, but the proxy-peer
+ * still sends a reply. This is allowed in dbus1, but not in kdbus. We
+ * don't want to track reply-windows in the proxy, so we simply ignore
+ * EPERM for all replies. The only downside is, that callers are no
+ * longer notified if their replies are dropped. However, this is
+ * equivalent to the caller's timeout to expire, so this should be
+ * acceptable. Nobody sane sends replies without a matching method-call,
+ * so nobody should care. */
+ r = 1;
+ } else {
+ r = k;
+ log_error_errno(r, "Failed to send message to client: %m");
+ goto finish;
+ }
+ } else
+ r = 1;
}
}
continue;
}
+ /* Read messages from our client, to pass them on to the bus */
r = sd_bus_process(b, &m);
if (r < 0) {
/* treat 'connection reset by peer' as clean exit condition */
if (r == -ECONNRESET)
r = 0;
else
- log_error("Failed to process bus b: %s", strerror(-r));
+ log_error_errno(r, "Failed to process bus b: %m");
goto finish;
}
if (m) {
+ bool processed = false;
+
/* We officially got EOF, let's quit */
if (sd_bus_message_is_signal(m, "org.freedesktop.DBus.Local", "Disconnected")) {
r = 0;
k = process_hello(a, b, m, &got_hello);
if (k < 0) {
r = k;
- log_error("Failed to process HELLO: %s", strerror(-r));
+ log_error_errno(r, "Failed to process HELLO: %m");
goto finish;
+ } else if (k > 0) {
+ processed = true;
+ r = 1;
}
- if (k > 0)
- r = k;
- else {
- k = process_policy(a, b, m);
- if (k < 0) {
- r = k;
- log_error("Failed to process policy: %s", strerror(-r));
- goto finish;
- }
-
- k = process_driver(a, b, m);
+ if (!processed) {
+ k = process_driver(a, b, m, policy, &ucred, owned_names);
if (k < 0) {
r = k;
- log_error("Failed to process driver calls: %s", strerror(-r));
+ log_error_errno(r, "Failed to process driver calls: %m");
goto finish;
+ } else if (k > 0) {
+ processed = true;
+ r = 1;
}
- if (k > 0)
- r = k;
- else {
- k = sd_bus_send(a, m, NULL);
- if (k < 0) {
- if (k == -ECONNRESET)
- r = 0;
- else {
- r = k;
- log_error("Failed to send message: %s", strerror(-r));
+ if (!processed) {
+
+ for (;;) {
+ if (policy) {
+ k = process_policy(b, a, m, policy, &ucred, owned_names);
+ if (k < 0) {
+ r = k;
+ log_error_errno(r, "Failed to process policy: %m");
+ goto finish;
+ } else if (k > 0) {
+ processed = true;
+ r = 1;
+ break;
+ }
}
- goto finish;
+ k = sd_bus_send(a, m, NULL);
+ if (k < 0) {
+ if (k == -EREMCHG) {
+ /* The name database changed since the policy check, hence let's check again */
+ continue;
+ } else if (k == -ECONNRESET) {
+ r = 0;
+ goto finish;
+ } else if (k == -EPERM && m->reply_cookie > 0) {
+ /* see above why EPERM is ignored for replies */
+ r = 1;
+ } else {
+ r = k;
+ log_error_errno(r, "Failed to send message to bus: %m");
+ goto finish;
+ }
+ } else
+ r = 1;
+
+ break;
}
}
}
fd = sd_bus_get_fd(a);
if (fd < 0) {
- log_error("Failed to get fd: %s", strerror(-r));
+ log_error_errno(r, "Failed to get fd: %m");
goto finish;
}
events_a = sd_bus_get_events(a);
if (events_a < 0) {
- log_error("Failed to get events mask: %s", strerror(-r));
+ log_error_errno(r, "Failed to get events mask: %m");
goto finish;
}
r = sd_bus_get_timeout(a, &timeout_a);
if (r < 0) {
- log_error("Failed to get timeout: %s", strerror(-r));
+ log_error_errno(r, "Failed to get timeout: %m");
goto finish;
}
events_b = sd_bus_get_events(b);
if (events_b < 0) {
- log_error("Failed to get events mask: %s", strerror(-r));
+ log_error_errno(r, "Failed to get events mask: %m");
goto finish;
}
r = sd_bus_get_timeout(b, &timeout_b);
if (r < 0) {
- log_error("Failed to get timeout: %s", strerror(-r));
+ log_error_errno(r, "Failed to get timeout: %m");
goto finish;
}
r = ppoll(pollfd, 3, ts, NULL);
if (r < 0) {
- log_error("ppoll() failed: %m");
+ log_error_errno(errno, "ppoll() failed: %m");
goto finish;
}
}
"STOPPING=1\n"
"STATUS=Shutting down.");
- policy_free(&policy);
+ policy_free(&policy_buffer);
strv_free(arg_configuration);
free(arg_address);
~ianmdlvl / elogind.git / blobdiff