From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lakshmi Ramasubramanian Date: Fri, 7 Aug 2020 14:12:13 -0700 Subject: [LTP] [PATCH v2 3/4] IMA: Add a test to verify measurement of certificate imported into a keyring In-Reply-To: <20200807204652.5928-4-pvorel@suse.cz> References: <20200807204652.5928-1-pvorel@suse.cz> <20200807204652.5928-4-pvorel@suse.cz> Message-ID: List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: ltp@lists.linux.it On 8/7/20 1:46 PM, Petr Vorel wrote: Hi Petr, > From: Lachlan Sneff > > The IMA subsystem supports measuring certificates that have been > imported into either system built-in or user-defined keyrings. > A test to verify measurement of a certificate imported > into a keyring is required. > > Add an IMA measurement test that verifies that an x509 certificate > can be imported into a newly-created, user-defined keyring and measured > correctly by the IMA subsystem. > > A certificate used by the test is included in the `datafiles/keys` > directory. > > There can be restrictions on importing a certificate into a builtin > trusted keyring. For example, the `.ima` keyring requires that > imported certs be signed by a kernel private key in certain > kernel configurations. For this reason, this test defines > a user-defined keyring and imports a certificate into that. > > Reviewed-by: Petr Vorel > Signed-off-by: Lachlan Sneff > [ pvorel: Added key_import_test into keycheck.policy, reword > instructions in README.md, LTP API related fixes ] > Signed-off-by: Petr Vorel > --- > I did various changes: > * fix error check in pipe command (grep $keyring_name > $ASCII_MEASUREMENTS ...) $? contains exit code just of last command > (xxd) => check for empty file. > * use more propriate error flags (TCONF => TFAIL, but some of them could > be also TBROK) > * tst_brk => tst_res && return in test1 (to give chance test2 to be run) > * add TINFO message about test > * remove obvious comment Thanks for updating the patches. In testcases/kernel/security/integrity/ima/datafiles/ima_keys/Makefile the following change (include x509_ima.der) needed to be made to run ima_keys.sh tests INSTALL_TARGETS := *.policy x509_ima.der Other than that the patches look good. thanks, -lakshmi > > .../kernel/security/integrity/ima/README.md | 12 ++-- > .../ima/datafiles/ima_keys/keycheck.policy | 2 +- > .../ima/datafiles/ima_keys/x509_ima.der | Bin 0 -> 650 bytes > .../security/integrity/ima/tests/ima_keys.sh | 68 +++++++++++++++--- > 4 files changed, 69 insertions(+), 13 deletions(-) > create mode 100644 testcases/kernel/security/integrity/ima/datafiles/ima_keys/x509_ima.der > > diff --git a/testcases/kernel/security/integrity/ima/README.md b/testcases/kernel/security/integrity/ima/README.md > index 392e1e868..68d046678 100644 > --- a/testcases/kernel/security/integrity/ima/README.md > +++ b/testcases/kernel/security/integrity/ima/README.md > @@ -16,11 +16,15 @@ space, may contain equivalent measurement tcb rules, detecting them would > require `IMA_READ_POLICY=y` therefore ignore this option. > > ### IMA key test > -`ima_keys.sh` requires a readable IMA policy, as well as a loaded policy > -with `func=KEY_CHECK keyrings=...`, see example in `keycheck.policy`. > +The measuring keys test (first test) in `ima_keys.sh` requires a readable IMA > +policy, as well as a loaded measure policy with `func=KEY_CHECK keyrings=...`. > > -As well as what's required for the IMA tests, the following are also required > --in the kernel configuration: > +The certificate import test (second test) require measure policy with > +`func=KEY_CHECK keyrings=key_import_test`. Valid policy for both is in > +`keycheck.policy`. > + > +As well as what's required for the IMA tests, key tests require reading the IMA > +policy allowed in the kernel configuration: > ``` > CONFIG_IMA_READ_POLICY=y > ``` > diff --git a/testcases/kernel/security/integrity/ima/datafiles/ima_keys/keycheck.policy b/testcases/kernel/security/integrity/ima/datafiles/ima_keys/keycheck.policy > index 3f1934a3d..623162002 100644 > --- a/testcases/kernel/security/integrity/ima/datafiles/ima_keys/keycheck.policy > +++ b/testcases/kernel/security/integrity/ima/datafiles/ima_keys/keycheck.policy > @@ -1 +1 @@ > -measure func=KEY_CHECK keyrings=.ima|.evm|.builtin_trusted_keys|.blacklist template=ima-buf > +measure func=KEY_CHECK keyrings=.ima|.evm|.builtin_trusted_keys|.blacklist|key_import_test template=ima-buf > diff --git a/testcases/kernel/security/integrity/ima/datafiles/ima_keys/x509_ima.der b/testcases/kernel/security/integrity/ima/datafiles/ima_keys/x509_ima.der > new file mode 100644 > index 0000000000000000000000000000000000000000..92be058da22adffa9d6b6e51efa0c737ebbbbdcd > GIT binary patch > literal 650 > zcmXqLVrnyJVtl`VnTe5!NhJD#vj69`9|BBf8}FEsx@^_9$Clp>c-c6$+C196^D;7W > zvoaV27z!HjvoVLVaPe?t z3}oO&a59SVLzFncG#ki?^BP(jSQr@@7#Ud_7)6Qm8W{k&hEOgIY;2s5>?=lA2Ij_I > z27|^VOo=tim8DK0r^FsU > zl)K`}`+CO4@4KBkoLmcj?fH`%wbDvU6-SMf6Eh}{&)1rdsOoNQ-1fgBQ1t{ > zVTqGwuK95LlFE)6i{@=vlP6!2`Y}x zl@(@W{LjK zkhC(3gn?Lt$m4W@56wQ)?QVKW z-o7mOwCAzaT*~`Y4wxFtmNA_89`W;j{r#iww*5OC5vgEziqD_%=ki$*`;s}`Pfwi{ > zbotZ0X`ckHOmaVLm85n@E9hN_K;~PUB>DFAzh(;(UoMln9V>g;W#-LUGS7A`nYQKY > WBem{7L5JThS+;$vggi%(*E;~nlJ80Y > > literal 0 > HcmV?d00001 > > diff --git a/testcases/kernel/security/integrity/ima/tests/ima_keys.sh b/testcases/kernel/security/integrity/ima/tests/ima_keys.sh > index 53c289054..30950904e 100755 > --- a/testcases/kernel/security/integrity/ima/tests/ima_keys.sh > +++ b/testcases/kernel/security/integrity/ima/tests/ima_keys.sh > @@ -6,8 +6,8 @@ > # > # Verify that keys are measured correctly based on policy. > > -TST_NEEDS_CMDS="cut grep sed tr xxd" > -TST_CNT=1 > +TST_NEEDS_CMDS="cmp cut grep sed tr xxd" > +TST_CNT=2 > TST_NEEDS_DEVICE=1 > > . ima_setup.sh > @@ -20,20 +20,22 @@ test1() > local pattern="func=KEY_CHECK" > local test_file="file.txt" > > - tst_res TINFO "verifying key measurement for keyrings and templates specified in IMA policy file" > + tst_res TINFO "verify key measurement for keyrings and templates specified in IMA policy" > > require_ima_policy_content "$pattern" > keycheck_lines=$(check_ima_policy_content "$pattern" "") > keycheck_line=$(echo "$keycheck_lines" | grep "keyrings" | head -n1) > > if [ -z "$keycheck_line" ]; then > - tst_brk TCONF "ima policy does not specify a keyrings to check" > + tst_res TCONF "IMA policy does not specify a keyrings to check" > + return > fi > > keyrings=$(echo "$keycheck_line" | tr " " "\n" | grep "keyrings" | \ > sed "s/\./\\\./g" | cut -d'=' -f2) > if [ -z "$keyrings" ]; then > - tst_brk TCONF "ima policy has a keyring key-value specifier, but no specified keyrings" > + tst_res TCONF "IMA policy has a keyring key-value specifier, but no specified keyrings" > + return > fi > > templates=$(echo "$keycheck_line" | tr " " "\n" | grep "template" | \ > @@ -49,11 +51,13 @@ test1() > > echo "$line" | cut -d' ' -f6 | xxd -r -p > $test_file > > - expected_digest="$(compute_digest $algorithm $test_file)" || \ > - tst_brk TCONF "cannot compute digest for $algorithm" > + if ! expected_digest="$(compute_digest $algorithm $test_file)"; then > + tst_res TCONF "cannot compute digest for $algorithm" > + return > + fi > > if [ "$digest" != "$expected_digest" ]; then > - tst_res TFAIL "incorrect digest was found for the ($keyring) keyring" > + tst_res TFAIL "incorrect digest was found for $keyring keyring" > return > fi > done > @@ -61,4 +65,52 @@ test1() > tst_res TPASS "specified keyrings were measured correctly" > } > > +# Create a new keyring, import a certificate into it, and verify > +# that the certificate is measured correctly by IMA. > +test2() > +{ > + tst_require_cmds evmctl keyctl openssl > + > + local cert_file="$TST_DATAROOT/x509_ima.der" > + local keyring_name="key_import_test" > + local temp_file="file.txt" > + local keyring_id > + > + tst_res TINFO "verify measurement of certificate imported into a keyring" > + > + if ! check_ima_policy_content "^measure.*func=KEY_CHECK.*keyrings=.*$keyring_name"; then > + tst_brk TCONF "IMA policy does not contain $keyring_name keyring" > + fi > + > + keyctl new_session > /dev/null > + > + keyring_id=$(keyctl newring $keyring_name @s) || \ > + tst_brk TBROK "unable to create a new keyring" > + > + tst_is_num $keyring_id || \ > + tst_brk TBROK "unable to parse the new keyring id" > + > + evmctl import $cert_file $keyring_id > /dev/null || \ > + tst_brk TBROK "unable to import a certificate into $keyring_name keyring" > + > + grep $keyring_name $ASCII_MEASUREMENTS | tail -n1 | cut -d' ' -f6 | \ > + xxd -r -p > $temp_file > + > + if [ ! -s $temp_file ]; then > + tst_res TFAIL "keyring $keyring_name not found in $ASCII_MEASUREMENTS" > + return > + fi > + > + if ! openssl x509 -in $temp_file -inform der > /dev/null; then > + tst_res TFAIL "logged certificate is not a valid x509 certificate" > + return > + fi > + > + if cmp -s $temp_file $cert_file; then > + tst_res TPASS "logged certificate matches the original" > + else > + tst_res TFAIL "logged certificate does not match original" > + fi > +} > + > tst_run >