4c80d201ace0377312c27143afab04e9c9f1ee64Filipe Brandenburger

#include <sys/types.h>

#include <unistd.h>

#include <string.h>

#include <errno.h>

#include <stddef.h>

#include "log.h"

#include "util.h"

#include "sd-bus.h"

#include "bus-internal.h"

#include "bus-message.h"

#include "bus-util.h"

#include "build.h"

#include "strv.h"

#include "def.h"

#include "capability.h"

#include "bus-control.h"

#include "set.h"

#include "driver.h"

#include "synthesize.h"

static int get_creds_by_name(sd_bus *bus, const char *name, uint64_t mask, sd_bus_creds **_creds, sd_bus_error *error) {

_cleanup_bus_creds_unref_ sd_bus_creds *c = NULL;

int r;

assert(bus);

assert(name);

assert(_creds);

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);

if (r < 0)

return r;

if ((c->mask & mask) != mask)

return -ENOTSUP;

*_creds = c;

c = NULL;

return 0;

}

static int get_creds_by_message(sd_bus *bus, sd_bus_message *m, uint64_t mask, sd_bus_creds **_creds, sd_bus_error *error) {

const char *name;

int r;

assert(bus);

assert(m);

assert(_creds);

r = sd_bus_message_read(m, "s", &name);

if (r < 0)

return r;

return get_creds_by_name(bus, name, mask, _creds, error);

}

int bus_proxy_process_driver(sd_bus *a, sd_bus *b, sd_bus_message *m, SharedPolicy *sp, const struct ucred *ucred, Set *owned_names) {

int r;

assert(a);

assert(b);

assert(m);

if (!a->is_kernel)

return 0;

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 (!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\" "

"\"http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd\">\n"

"<node>\n"

" <interface name=\"org.freedesktop.DBus.Introspectable\">\n"

" <method name=\"Introspect\">\n"

" <arg name=\"data\" type=\"s\" direction=\"out\"/>\n"

" </method>\n"

" </interface>\n"

" <interface name=\"org.freedesktop.DBus\">\n"

" <method name=\"AddMatch\">\n"

" <arg type=\"s\" direction=\"in\"/>\n"

" </method>\n"

" <method name=\"RemoveMatch\">\n"

" <arg type=\"s\" direction=\"in\"/>\n"

" </method>\n"

" <method name=\"GetConnectionSELinuxSecurityContext\">\n"

" <arg type=\"s\" direction=\"in\"/>\n"

" <arg type=\"ay\" direction=\"out\"/>\n"

" </method>\n"

" <method name=\"GetConnectionUnixProcessID\">\n"

" <arg type=\"s\" direction=\"in\"/>\n"

" <arg type=\"u\" direction=\"out\"/>\n"

" </method>\n"

" <method name=\"GetConnectionUnixUser\">\n"

" <arg type=\"s\" direction=\"in\"/>\n"

" <arg type=\"u\" direction=\"out\"/>\n"

" </method>\n"

" <method name=\"GetId\">\n"

" <arg type=\"s\" direction=\"out\"/>\n"

" </method>\n"

" <method name=\"GetNameOwner\">\n"

" <arg type=\"s\" direction=\"in\"/>\n"

" <arg type=\"s\" direction=\"out\"/>\n"

" </method>\n"

" <method name=\"Hello\">\n"

" <arg type=\"s\" direction=\"out\"/>\n"

" </method>\n"

" <method name=\"ListActivatableNames\">\n"

" <arg type=\"as\" direction=\"out\"/>\n"

" </method>\n"

" <method name=\"ListNames\">\n"

" <arg type=\"as\" direction=\"out\"/>\n"

" </method>\n"

" <method name=\"ListQueuedOwners\">\n"

" <arg type=\"s\" direction=\"in\"/>\n"

" <arg type=\"as\" direction=\"out\"/>\n"

" </method>\n"

" <method name=\"NameHasOwner\">\n"

" <arg type=\"s\" direction=\"in\"/>\n"

" <arg type=\"b\" direction=\"out\"/>\n"

" </method>\n"

" <method name=\"ReleaseName\">\n"

" <arg type=\"s\" direction=\"in\"/>\n"

" <arg type=\"u\" direction=\"out\"/>\n"

" </method>\n"

" <method name=\"ReloadConfig\">\n"

" </method>\n"

" <method name=\"RequestName\">\n"

" <arg type=\"s\" direction=\"in\"/>\n"

" <arg type=\"u\" direction=\"in\"/>\n"

" <arg type=\"u\" direction=\"out\"/>\n"

" </method>\n"

" <method name=\"StartServiceByName\">\n"

" <arg type=\"s\" direction=\"in\"/>\n"

" <arg type=\"u\" direction=\"in\"/>\n"

" <arg type=\"u\" direction=\"out\"/>\n"

" </method>\n"

" <method name=\"UpdateActivationEnvironment\">\n"

" <arg type=\"a{ss}\" direction=\"in\"/>\n"

" </method>\n"

" <signal name=\"NameAcquired\">\n"

" <arg type=\"s\"/>\n"

" </signal>\n"

" <signal name=\"NameLost\">\n"

" <arg type=\"s\"/>\n"

" </signal>\n"

" <signal name=\"NameOwnerChanged\">\n"

" <arg type=\"s\"/>\n"

" <arg type=\"s\"/>\n"

" <arg type=\"s\"/>\n"

" </signal>\n"

" </interface>\n"

"</node>\n");

} 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);

r = sd_bus_add_match(a, NULL, match, NULL, NULL);

if (r < 0)

return synthetic_reply_method_errno(m, r, NULL);

return synthetic_reply_method_return(m, 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);

r = bus_remove_match_by_string(a, match, NULL, NULL);

if (r == 0)

return synthetic_reply_method_error(m, &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_MATCH_RULE_NOT_FOUND, "Match rule not found"));

if (r < 0)

return synthetic_reply_method_errno(m, r, NULL);

return synthetic_reply_method_return(m, NULL);

} else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "GetConnectionSELinuxSecurityContext")) {

_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);

return synthetic_reply_method_return(m, "y", creds->label, strlen(creds->label));

} else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "GetConnectionUnixProcessID")) {

_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);

return synthetic_reply_method_return(m, "u", (uint32_t) creds->pid);

} else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "GetConnectionUnixUser")) {

_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_EUID, &creds, &error);

if (r < 0)

return synthetic_reply_method_errno(m, r, &error);

return synthetic_reply_method_return(m, "u", (uint32_t) creds->euid);

} else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "GetId")) {

sd_id128_t server_id;

char buf[SD_ID128_STRING_MAX];

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);

return synthetic_reply_method_return(m, "s", sd_id128_to_string(server_id, buf));

} else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "GetNameOwner")) {

const char *name;

_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);

if (streq(name, "org.freedesktop.DBus"))

return synthetic_reply_method_return(m, "s", "org.freedesktop.DBus");

r = get_creds_by_name(a, name, SD_BUS_CREDS_UNIQUE_NAME, &creds, &error);

if (r < 0)

return synthetic_reply_method_errno(m, r, &error);

return synthetic_reply_method_return(m, "s", creds->unique_name);

} 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);

/* Let's sort the names list to make it stable */

strv_sort(names);

return synthetic_reply_method_return_strv(m, names);

} 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);

r = strv_extend(&names, "org.freedesktop.DBus");

if (r < 0)

return synthetic_reply_method_errno(m, r, NULL);

/* Let's sort the names list to make it stable */

strv_sort(names);

return synthetic_reply_method_return_strv(m, names);

} else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "ListQueuedOwners")) {

struct kdbus_cmd_list cmd = {

.flags = KDBUS_LIST_QUEUED,

.size = sizeof(cmd),

};

struct kdbus_info *name_list, *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);

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);

return synthetic_reply_method_errno(m, r, &error);

}

if (r < 0)

return synthetic_reply_method_errno(m, r, NULL);

r = ioctl(a->input_fd, KDBUS_CMD_LIST, &cmd);

if (r < 0)

return synthetic_reply_method_errno(m, -errno, NULL);

name_list = (struct kdbus_info *) ((uint8_t *) a->kdbus_buffer + cmd.offset);

KDBUS_FOREACH(name, name_list, cmd.list_size) {

const char *entry_name = NULL;

struct kdbus_item *item;

char *n;

KDBUS_ITEM_FOREACH(item, name, items)

if (item->type == KDBUS_ITEM_OWNED_NAME)

entry_name = item->name.name;

if (!streq_ptr(entry_name, arg0))

continue;

if (asprintf(&n, ":1.%llu", (unsigned long long) name->id) < 0) {

err = -ENOMEM;

break;

}

r = strv_consume(&owners, n);

if (r < 0) {

err = r;

break;

}

}

r = bus_kernel_cmd_free(a, cmd.offset);

if (r < 0)

return synthetic_reply_method_errno(m, r, NULL);

if (err < 0)

return synthetic_reply_method_errno(m, err, NULL);

return synthetic_reply_method_return_strv(m, owners);

} 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 (streq(name, "org.freedesktop.DBus"))

return synthetic_reply_method_return(m, "b", true);

r = sd_bus_get_name_creds(a, name, 0, NULL);

if (r < 0 && r != -ESRCH && r != -ENXIO)

return synthetic_reply_method_errno(m, r, NULL);

return synthetic_reply_method_return(m, "b", r >= 0);

} 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);

r = sd_bus_release_name(a, name);

if (r < 0) {

if (r == -ESRCH)

return synthetic_reply_method_return(m, "u", BUS_NAME_NON_EXISTENT);

if (r == -EADDRINUSE)

return synthetic_reply_method_return(m, "u", BUS_NAME_NOT_OWNER);

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")) {

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 = shared_policy_reload(sp);

if (r < 0)

return synthetic_reply_method_errno(m, r, NULL);

return synthetic_reply_method_return(m, NULL);

} 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 (sp) {

Policy *policy;

bool denied;

policy = shared_policy_acquire(sp);

denied = !policy_check_own(policy, ucred->uid, ucred->gid, name);

shared_policy_release(sp, policy);

if (denied)

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);

param = 0;

if (flags & BUS_NAME_ALLOW_REPLACEMENT)

param |= SD_BUS_NAME_ALLOW_REPLACEMENT;

if (flags & BUS_NAME_REPLACE_EXISTING)

param |= SD_BUS_NAME_REPLACE_EXISTING;

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 == -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);

}

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);

} else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "StartServiceByName")) {

_cleanup_bus_message_unref_ sd_bus_message *msg = NULL;

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 (flags != 0)

return synthetic_reply_method_errno(m, -EINVAL, NULL);

r = sd_bus_get_name_creds(a, name, 0, NULL);

if (r >= 0 || streq(name, "org.freedesktop.DBus"))

return synthetic_reply_method_return(m, "u", BUS_START_REPLY_ALREADY_RUNNING);

if (r != -ESRCH)

return synthetic_reply_method_errno(m, r, NULL);

r = sd_bus_message_new_method_call(

a,

&msg,

name,

"/",

"org.freedesktop.DBus.Peer",

"Ping");

if (r < 0)

return synthetic_reply_method_errno(m, r, NULL);

r = sd_bus_send(a, msg, NULL);

if (r < 0)

return synthetic_reply_method_errno(m, r, NULL);

return synthetic_reply_method_return(m, "u", BUS_START_REPLY_SUCCESS);

} else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "UpdateActivationEnvironment")) {

_cleanup_bus_message_unref_ sd_bus_message *msg = NULL;

_cleanup_strv_free_ char **args = 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)

return synthetic_reply_method_errno(m, r, NULL);

while ((r = sd_bus_message_enter_container(m, SD_BUS_TYPE_DICT_ENTRY, "ss")) > 0) {

_cleanup_free_ char *s = NULL;

const char *key;

const char *value;

r = sd_bus_message_read(m, "ss", &key, &value);

if (r < 0)

return synthetic_reply_method_errno(m, r, NULL);

s = strjoin(key, "=", value, NULL);

if (!s)

return synthetic_reply_method_errno(m, -ENOMEM, NULL);

r = strv_extend(&args, s);

if (r < 0)

return synthetic_reply_method_errno(m, r, NULL);

r = sd_bus_message_exit_container(m);

if (r < 0)

return synthetic_reply_method_errno(m, r, NULL);

}

r = sd_bus_message_exit_container(m);

if (r < 0)

return synthetic_reply_method_errno(m, r, NULL);

if (!args)

return synthetic_reply_method_errno(m, -EINVAL, NULL);

r = sd_bus_message_new_method_call(

a,

&msg,

"org.freedesktop.systemd1",

"/org/freedesktop/systemd1",

"org.freedesktop.systemd1.Manager",

"SetEnvironment");

if (r < 0)

return synthetic_reply_method_errno(m, r, NULL);

r = sd_bus_message_append_strv(msg, args);

if (r < 0)

return synthetic_reply_method_errno(m, r, NULL);

r = sd_bus_call(a, msg, 0, NULL, NULL);

if (r < 0)

return synthetic_reply_method_errno(m, r, NULL);

return synthetic_reply_method_return(m, NULL);

} else {

_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;

r = sd_bus_error_setf(&error, SD_BUS_ERROR_UNKNOWN_METHOD, "Unknown method '%s'.", m->member);

return synthetic_reply_method_errno(m, r, &error);

}

}