On Tue, 2019-05-14 at 10:18 -0700, Lakshmi wrote: > On 5/12/19 5:37 PM, nramas@xxxxxxxxxxxxxxxxxxx wrote: > > Hello, > > > > I am trying to test IMA signature validation using EVMCTL version 1.1 > > Am running kernel version 5.1.0 rc2 on an Ubuntu desktop. > > > > I have followed the steps given in the README below: > > https://sourceforge.net/p/linux-ima/ima-evm-utils/ci/master/tree/README > > > > I have created private\public key pair and the DER encoded certificate > > for the private key. Imported the signed DER encoded cert to IMA keyring. > > > > keyctl show %keyring:.ima > > Keyring > > 1054868458 ---lswrv 0 0 keyring: .ima > > 740136756 --als--v 0 0 \_ asymmetric: hostname: whoami signing > > key: 85512d09fc12c7f38b9679352651dcb365903336 > > > > cat /proc/keys | grep -i signing > > 2c1d9734 I--Q--- 1 perm 39010000 0 0 asymmetri hostname: > > whoami signing key: 85512d09fc12c7f38b9679352651dcb365903336: X509.rsa > > 65903336 [] > > > > evmctl ima_sign -a sha256 --key /etc/keys/privkey_evm.pem > > /boot/vmlinuz-5.1.0-rc2+ > > > > In the key identifier set in security.ima attribute the key identifier > > should be 65903336 to match the key in the IMA keyring. But it is b8847de9. > > > > getfattr -d -m ima -e hex /boot/vmlinuz-5.1.0-rc2+ > > getfattr: Removing leading '/' from absolute path names > > # file: boot/vmlinuz-5.1.0-rc2+ > > security.ima=0x030204b8847de90080b06c8d5517a6afea64805c2871581b256a4efcf7ce4ba079a85545e5e70a2603596366c4e342f11052291e9b558ccb1a1208747f12c45bbe4cee59c727f308a46e951c0df9b1f6b443a8c0a4f5ac881d49e0cce9927b64eeab29c5688aba0758e5cfb30c26fd5b131c2206f1b208d48a427c53a77ae5baf98f4994a19f67b163 > > > > > > When trying to verify the IMA signature I get the following error > > > > evmctl ima_verify --key /etc/keys/x509_evm.der /boot/vmlinuz-5.1.0-rc2+ > > /boot/vmlinuz-5.1.0-rc2+: RSA_public_decrypt() failed: -1 > > error:0407008A:rsa routines:RSA_padding_check_PKCS1_type_1:invalid padding > > error:04067072:rsa routines:rsa_ossl_public_decrypt:padding check failed > > > > This looks very similar to the issue discussed here > > https://sourceforge.net/p/linux-ima/mailman/message/34290588/ > > > > But the bug discussed in the above thread looks to be fixed though. > > > > Am I missing something? > > > > Thank you. > > > > -lakshmi > > > > I have tried the above on Linux kernel 4.18.0-17 as well and am seeing > the same behavior. > > I am unable to find older versions (prior to Version 1.1) of evmctl to > check if the behavior is different. Missing from this log is the list of keys on the .ima keyring. Mimi
