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systemd-analyze: Add ProtectKernelLogs to security

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This commit is contained in:
Kevin Kuehler 2019-11-13 17:37:05 -08:00
parent 6168ae5840
commit 82dce83b19
1 changed files with 15 additions and 0 deletions
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15
src/analyze/analyze-security.c
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@ -64,6 +64,7 @@ struct security_info {
bool protect_control_groups;
bool protect_kernel_modules;
bool protect_kernel_tunables;
bool protect_kernel_logs;
char *protect_home;
char *protect_system;
@ -772,6 +773,16 @@ static const struct security_assessor security_assessor_table[] = {
.assess = assess_bool,
.offset = offsetof(struct security_info, protect_kernel_tunables),
},
{
.id = "ProtectKernelLogs=",
.description_good = "Service cannot read from or write to the kernel log ring buffer",
.description_bad = "Service may read from or write to the kernel log ring buffer",
.url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#ProtectKernelLogs=",
.weight = 1000,
.range = 1,
.assess = assess_bool,
.offset = offsetof(struct security_info, protect_kernel_logs),
},
{
.id = "ProtectHome=",
.url = "https://www.freedesktop.org/software/systemd/man/systemd.exec.html#ProtectHome=",
@ -1906,6 +1917,7 @@ static int acquire_security_info(sd_bus *bus, const char *name, struct security_
{ "ProtectHostname", "b", NULL, offsetof(struct security_info, protect_hostname) },
{ "ProtectKernelModules", "b", NULL, offsetof(struct security_info, protect_kernel_modules) },
{ "ProtectKernelTunables", "b", NULL, offsetof(struct security_info, protect_kernel_tunables) },
{ "ProtectKernelLogs", "b", NULL, offsetof(struct security_info, protect_kernel_logs) },
{ "ProtectSystem", "s", NULL, offsetof(struct security_info, protect_system) },
{ "RemoveIPC", "b", NULL, offsetof(struct security_info, remove_ipc) },
{ "RestrictAddressFamilies", "(bas)", property_read_restrict_address_families, 0 },
@ -1980,6 +1992,9 @@ static int acquire_security_info(sd_bus *bus, const char *name, struct security_
if (info->protect_kernel_modules)
info->capability_bounding_set &= ~(UINT64_C(1) << CAP_SYS_MODULE);
if (info->protect_kernel_logs)
info->capability_bounding_set &= ~(UINT64_C(1) << CAP_SYSLOG);
if (info->private_devices)
info->capability_bounding_set &= ~((UINT64_C(1) << CAP_MKNOD) |
(UINT64_C(1) << CAP_SYS_RAWIO));