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bus-proxy: automatically detect scope of bus and derive which XML snippets to load from that

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This commit is contained in:
Lennart Poettering 2014-11-28 16:14:39 +01:00
parent e3afaf6b8e
commit 2e43ad9ca6
3 changed files with 38 additions and 27 deletions
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61
src/bus-proxyd/bus-proxyd.c
View File

@ -1381,39 +1381,50 @@ int main(int argc, char *argv[]) {
}
if (a->is_kernel) {
_cleanup_bus_creds_unref_ sd_bus_creds *bus_creds = NULL;
uid_t bus_uid;
if (!arg_configuration) {
const char *scope;
r = sd_bus_get_owner_creds(a, SD_BUS_CREDS_UID, &bus_creds);
if (r < 0) {
log_error_errno(r, "Failed to get bus creds: %m");
goto finish;
}
r = sd_bus_creds_get_uid(bus_creds, &bus_uid);
if (r < 0) {
log_error_errno(r, "Failed to get bus owner UID: %m");
goto finish;
}
if (bus_uid == 0) {
/* We only enforce the old XML policy on
* kernel busses owned by root users. */
r = policy_load(&policy_buffer, arg_configuration);
r = sd_bus_get_scope(a, &scope);
if (r < 0) {
log_error_errno(r, "Failed to load policy: %m");
log_error_errno(r, "Couldn't determine bus scope: %m");
goto finish;
}
if (!policy_check_hello(&policy_buffer, ucred.uid, ucred.gid)) {
log_error("Policy denied connection");
r = -EPERM;
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;
}
policy_dump(&policy_buffer);
policy = &policy_buffer;
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 (!policy_check_hello(policy, ucred.uid, ucred.gid)) {
r = log_error_errno(EPERM, "Policy denied connection.");
goto finish;
}
}

2
units/systemd-bus-proxyd@.service.in
View File

@ -12,7 +12,7 @@ Description=Legacy D-Bus Protocol Compatibility Daemon
# The first argument will be replaced by the service by information on
# the process requesting the proxy, we need a placeholder to keep the
# space available for this.
ExecStart=@rootlibexecdir@/systemd-bus-proxyd --drop-privileges --address=kernel:path=/sys/fs/kdbus/0-system/bus --configuration=/etc/dbus-1/system.conf --configuration=/etc/dbus-1/system-local.conf --configuration=/etc/dbus-1/system.d/ xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
ExecStart=@rootlibexecdir@/systemd-bus-proxyd --drop-privileges --address=kernel:path=/sys/fs/kdbus/0-system/bus xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
NotifyAccess=main
CapabilityBoundingSet=CAP_IPC_OWNER CAP_SETUID CAP_SETGID CAP_SETPCAP
PrivateTmp=yes

2
units/user/systemd-bus-proxyd@.service.in
View File

@ -12,5 +12,5 @@ Description=Legacy D-Bus Protocol Compatibility Daemon
# The first argument will be replaced by the service by information on
# the process requesting the proxy, we need a placeholder to keep the
# space available for this.
ExecStart=@rootlibexecdir@/systemd-bus-proxyd --address=kernel:path=/sys/fs/kdbus/%U-user/bus --configuration=/etc/dbus-1/session.conf --configuration=/etc/dbus-1/session-local.conf --configuration=/etc/dbus-1/session.d/ xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
ExecStart=@rootlibexecdir@/systemd-bus-proxyd --address=kernel:path=/sys/fs/kdbus/%U-user/bus xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
NotifyAccess=main