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From be9fad86ae9ab721cd295210962da85706b839e9 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Luk=C3=A1=C5=A1=20Nykr=C3=BDn?= <lnykryn@redhat.com>
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Date: Fri, 7 Oct 2016 03:08:21 +0200
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Subject: [PATCH] core: add possibility to set action for ctrl-alt-del burst
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 (#4105)
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For some certification, it should not be possible to reboot the machine through ctrl-alt-delete. Currently we suggest our customers to mask the ctrl-alt-delete target, but that is obviously not enough.
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Patching the keymaps to disable that is really not a way to go for them, because the settings need to be easily checked by some SCAP tools.
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Cherry-picked from: 24dd31c19ede505143833346ff850af942694aa6
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Resolves: #1353028
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---
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 man/systemd-system.conf.xml | 11 ++++++++
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 src/core/main.c             |  5 ++++
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 src/core/manager.c          | 51 +++++++++++++++++++++++++++----------
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 src/core/manager.h          | 14 +++++++++-
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 src/core/system.conf        |  1 +
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 5 files changed, 68 insertions(+), 14 deletions(-)
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diff --git a/man/systemd-system.conf.xml b/man/systemd-system.conf.xml
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index 39d19bc71..236c20d5f 100644
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--- a/man/systemd-system.conf.xml
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+++ b/man/systemd-system.conf.xml
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@@ -101,6 +101,17 @@
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         arguments.</para></listitem>
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       </varlistentry>
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+      <varlistentry>
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+        <term><varname>CtrlAltDelBurstAction=</varname></term>
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+
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+        <listitem><para>Defines what action will be performed
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+        if user presses Ctr-Alt-Delete more than 7 times in 2s.
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+        Can be set to <literal>reboot-force</literal>, <literal>poweroff-force</literal>
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+        or disabled with <literal>ignore</literal>. Defaults to
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+        <literal>reboot-force</literal>.
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+        </para></listitem>
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+      </varlistentry>
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+
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       <varlistentry>
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         <term><varname>CPUAffinity=</varname></term>
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diff --git a/src/core/main.c b/src/core/main.c
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index c9d8ce4a4..6ac9c9d44 100644
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--- a/src/core/main.c
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+++ b/src/core/main.c
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@@ -115,6 +115,7 @@ static FILE* arg_serialization = NULL;
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 static bool arg_default_cpu_accounting = false;
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 static bool arg_default_blockio_accounting = false;
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 static bool arg_default_memory_accounting = false;
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+static CADBurstAction arg_cad_burst_action = CAD_BURST_ACTION_REBOOT;
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 static void nop_handler(int sig) {}
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@@ -625,6 +626,8 @@ static int config_parse_join_controllers(const char *unit,
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         return 0;
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 }
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+static DEFINE_CONFIG_PARSE_ENUM(config_parse_cad_burst_action, cad_burst_action, CADBurstAction, "Failed to parse service restart specifier");
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+
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 static int parse_config_file(void) {
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         const ConfigTableItem items[] = {
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@@ -673,6 +676,7 @@ static int parse_config_file(void) {
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                 { "Manager", "DefaultCPUAccounting",      config_parse_bool,             0, &arg_default_cpu_accounting            },
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                 { "Manager", "DefaultBlockIOAccounting",  config_parse_bool,             0, &arg_default_blockio_accounting        },
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                 { "Manager", "DefaultMemoryAccounting",   config_parse_bool,             0, &arg_default_memory_accounting         },
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+                { "Manager", "CtrlAltDelBurstAction",     config_parse_cad_burst_action, 0, &arg_cad_burst_action},
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                 {}
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         };
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@@ -1690,6 +1694,7 @@ int main(int argc, char *argv[]) {
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         m->initrd_timestamp = initrd_timestamp;
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         m->security_start_timestamp = security_start_timestamp;
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         m->security_finish_timestamp = security_finish_timestamp;
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+        m->cad_burst_action = arg_cad_burst_action;
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         manager_set_default_rlimits(m, arg_default_rlimit);
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         manager_environment_add(m, NULL, arg_default_environment);
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diff --git a/src/core/manager.c b/src/core/manager.c
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index 6d045fdf3..9048dde96 100644
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--- a/src/core/manager.c
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+++ b/src/core/manager.c
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@@ -1859,6 +1859,35 @@ static int manager_start_target(Manager *m, const char *name, JobMode mode) {
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         return r;
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 }
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+static void manager_handle_ctrl_alt_del(Manager *m) {
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+        /* If the user presses C-A-D more than
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+         * 7 times within 2s, we reboot/shutdown immediately,
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+         * unless it was disabled in system.conf */
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+
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+        if (ratelimit_test(&m->ctrl_alt_del_ratelimit) || m->cad_burst_action == CAD_BURST_ACTION_IGNORE)
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+                manager_start_target(m, SPECIAL_CTRL_ALT_DEL_TARGET, JOB_REPLACE_IRREVERSIBLY);
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+        else {
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+                switch (m->cad_burst_action) {
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+
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+                case CAD_BURST_ACTION_REBOOT:
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+                        m->exit_code = MANAGER_REBOOT;
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+                        break;
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+
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+                case CAD_BURST_ACTION_POWEROFF:
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+                        m->exit_code = MANAGER_POWEROFF;
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+                        break;
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+
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+                default:
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+                        assert_not_reached("Unknown action.");
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+                }
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+
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+                log_notice("Ctrl-Alt-Del was pressed more than 7 times within 2s, performing immediate %s.",
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+                                cad_burst_action_to_string(m->cad_burst_action));
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+                status_printf(NULL, true, false, "Ctrl-Alt-Del was pressed more than 7 times within 2s, performing immediate %s.",
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+                                cad_burst_action_to_string(m->cad_burst_action));
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+        }
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+}
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+
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 static int manager_dispatch_signal_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
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         Manager *m = userdata;
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         ssize_t n;
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@@ -1909,19 +1938,7 @@ static int manager_dispatch_signal_fd(sd_event_source *source, int fd, uint32_t
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                 case SIGINT:
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                         if (m->running_as == SYSTEMD_SYSTEM) {
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-
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-                                /* If the user presses C-A-D more than
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-                                 * 7 times within 2s, we reboot
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-                                 * immediately. */
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-
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-                                if (ratelimit_test(&m->ctrl_alt_del_ratelimit))
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-                                        manager_start_target(m, SPECIAL_CTRL_ALT_DEL_TARGET, JOB_REPLACE_IRREVERSIBLY);
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-                                else {
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-                                        log_notice("Ctrl-Alt-Del was pressed more than 7 times within 2s, rebooting immediately.");
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-                                        status_printf(NULL, true, false, "Ctrl-Alt-Del was pressed more than 7 times within 2s, rebooting immediately.");
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-                                        m->exit_code = MANAGER_REBOOT;
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-                                }
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-
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+                                manager_handle_ctrl_alt_del(m);
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                                 break;
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                         }
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@@ -3319,3 +3336,11 @@ static const char *const manager_state_table[_MANAGER_STATE_MAX] = {
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 };
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 DEFINE_STRING_TABLE_LOOKUP(manager_state, ManagerState);
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+
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+static const char *const cad_burst_action_table[_CAD_BURST_ACTION_MAX] = {
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+        [CAD_BURST_ACTION_IGNORE] = "ignore",
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+        [CAD_BURST_ACTION_REBOOT] = "reboot-force",
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+        [CAD_BURST_ACTION_POWEROFF] = "poweroff-force",
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+};
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+
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+DEFINE_STRING_TABLE_LOOKUP(cad_burst_action, CADBurstAction);
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diff --git a/src/core/manager.h b/src/core/manager.h
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index 3e855db46..42be1fc43 100644
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--- a/src/core/manager.h
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+++ b/src/core/manager.h
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@@ -64,6 +64,14 @@ typedef enum ManagerExitCode {
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         _MANAGER_EXIT_CODE_INVALID = -1
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 } ManagerExitCode;
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+typedef enum CADBurstAction {
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+        CAD_BURST_ACTION_IGNORE,
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+        CAD_BURST_ACTION_REBOOT,
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+        CAD_BURST_ACTION_POWEROFF,
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+        _CAD_BURST_ACTION_MAX,
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+        _CAD_BURST_ACTION_INVALID = -1
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+} CADBurstAction;
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+
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 typedef enum StatusType {
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         STATUS_TYPE_EPHEMERAL,
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         STATUS_TYPE_NORMAL,
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@@ -300,8 +308,9 @@ struct Manager {
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         /* Used for processing polkit authorization responses */
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         Hashmap *polkit_registry;
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-        /* When the user hits C-A-D more than 7 times per 2s, reboot immediately... */
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+        /* When the user hits C-A-D more than 7 times per 2s, do something immediately... */
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         RateLimit ctrl_alt_del_ratelimit;
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+        CADBurstAction cad_burst_action;
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 };
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 int manager_new(SystemdRunningAs running_as, bool test_run, Manager **m);
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@@ -372,3 +381,6 @@ ManagerState manager_state(Manager *m);
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 const char *manager_state_to_string(ManagerState m) _const_;
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 ManagerState manager_state_from_string(const char *s) _pure_;
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+
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+const char *cad_burst_action_to_string(CADBurstAction a) _const_;
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+CADBurstAction cad_burst_action_from_string(const char *s) _pure_;
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diff --git a/src/core/system.conf b/src/core/system.conf
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index 231609033..a11f59903 100644
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--- a/src/core/system.conf
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+++ b/src/core/system.conf
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@@ -20,6 +20,7 @@
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 #CrashShell=no
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 #ShowStatus=yes
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 #CrashChVT=1
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+#CtrlAltDelBurstAction=reboot-force
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 #CPUAffinity=1 2
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 #JoinControllers=cpu,cpuacct net_cls,net_prio
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 #RuntimeWatchdogSec=0