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Merge pull request #17836 from poettering/tpm2-condition

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Add ConditionSecurity=tpm2
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Lennart Poettering 2020-12-03 20:13:45 +01:00 committed by GitHub
commit e267d76f73
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3 changed files with 20 additions and 5 deletions
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2
TODO
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@ -113,8 +113,6 @@ Features:
* systemd-firstboot: make sure to always use chase_symlinks() before
reading/writing files
* add ConditionSecurity=tpm2
* Remove any support for booting without /usr pre-mounted in the initrd entirely.
Update INITRD_INTERFACE.md accordingly.

6
man/systemd.unit.xml
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@ -1257,9 +1257,9 @@
<listitem><para><varname>ConditionSecurity=</varname> may be used to check whether the given
security technology is enabled on the system. Currently, the recognized values are
<literal>selinux</literal>, <literal>apparmor</literal>, <literal>tomoyo</literal>,
<literal>ima</literal>, <literal>smack</literal>, <literal>audit</literal> and
<literal>uefi-secureboot</literal>. The test may be negated by prepending an exclamation
mark.</para>
<literal>ima</literal>, <literal>smack</literal>, <literal>audit</literal>,
<literal>uefi-secureboot</literal> and <literal>tpm2</literal>. The test may be negated by prepending
an exclamation mark.</para>
</listitem>
</varlistentry>

17
src/shared/condition.c
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@ -480,6 +480,21 @@ static int condition_test_ac_power(Condition *c, char **env) {
return (on_ac_power() != 0) == !!r;
}
static int has_tpm2(void) {
int r;
/* Checks whether the system has at least one TPM2 resource manager device, i.e. at least one "tpmrm"
* class device */
r = dir_is_empty("/sys/class/tpmrm");
if (r == -ENOENT)
return false;
if (r < 0)
return log_debug_errno(r, "Failed to determine whether system has TPM2 support: %m");
return !r;
}
static int condition_test_security(Condition *c, char **env) {
assert(c);
assert(c->parameter);
@ -499,6 +514,8 @@ static int condition_test_security(Condition *c, char **env) {
return mac_tomoyo_use();
if (streq(c->parameter, "uefi-secureboot"))
return is_efi_secure_boot();
if (streq(c->parameter, "tpm2"))
return has_tpm2();
return false;
}