How to enable EVM feature?
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I want to enable IMA and EVM on an embedded device based on Debian.
I've installed evmctl (ima-evm-utils) on the machine.
The boot parameters related to IMA/EVM are:
ima_policy=tcb ima_appraise_tcb ima_appraise=fix ima_hash=sha256 ima_template=ima-sig evm=fix
Creating IMA hashes via evmctl ima_hash -a sha256 <file> works fine and xattr "security.ima" shows some content.
Also creating IMA signature via evmctl ima_sign -k <keyfile> <file> produces some result.
If it comes to EVM it does not work as good.
If I use evmctl sign -o -k privkey_evm.pem test on the same file I get an error message:
setxattr failed: test
errno: Operation not permitted (1)
With strace I can see this error:
lsetxattr("test", "security.evm", "52 .... 234", 137, 0) = -1 EPERM (Operation not permitted)
write(2, "setxattr failed: testn", 22setxattr failed: test
The key in use was created using ima-genkey-self.sh from ima-evm-utils repository on SourceForge
I am running these commands as root. (Without root also IMA attributes cannot be set.)
I am not sure in which places to look for possible reasons for these failures.
linux security
edited Mar 6 at 15:51
Rui F Ribeiro
41.9k1483142
asked Mar 6 at 15:30
imaevm_beginnerimaevm_beginner
11
add a comment |
I want to enable IMA and EVM on an embedded device based on Debian.
I've installed evmctl (ima-evm-utils) on the machine.
The boot parameters related to IMA/EVM are:
ima_policy=tcb ima_appraise_tcb ima_appraise=fix ima_hash=sha256 ima_template=ima-sig evm=fix
Creating IMA hashes via evmctl ima_hash -a sha256 <file> works fine and xattr "security.ima" shows some content.
Also creating IMA signature via evmctl ima_sign -k <keyfile> <file> produces some result.
If it comes to EVM it does not work as good.
If I use evmctl sign -o -k privkey_evm.pem test on the same file I get an error message:
setxattr failed: test
errno: Operation not permitted (1)
With strace I can see this error:
lsetxattr("test", "security.evm", "52 .... 234", 137, 0) = -1 EPERM (Operation not permitted)
write(2, "setxattr failed: testn", 22setxattr failed: test
The key in use was created using ima-genkey-self.sh from ima-evm-utils repository on SourceForge
I am running these commands as root. (Without root also IMA attributes cannot be set.)
I am not sure in which places to look for possible reasons for these failures.
linux security
edited Mar 6 at 15:51
Rui F Ribeiro
41.9k1483142
asked Mar 6 at 15:30
imaevm_beginnerimaevm_beginner
11
add a comment |
I want to enable IMA and EVM on an embedded device based on Debian.
I've installed evmctl (ima-evm-utils) on the machine.
The boot parameters related to IMA/EVM are:
ima_policy=tcb ima_appraise_tcb ima_appraise=fix ima_hash=sha256 ima_template=ima-sig evm=fix
Creating IMA hashes via evmctl ima_hash -a sha256 <file> works fine and xattr "security.ima" shows some content.
Also creating IMA signature via evmctl ima_sign -k <keyfile> <file> produces some result.
If it comes to EVM it does not work as good.
If I use evmctl sign -o -k privkey_evm.pem test on the same file I get an error message:
setxattr failed: test
errno: Operation not permitted (1)
With strace I can see this error:
lsetxattr("test", "security.evm", "52 .... 234", 137, 0) = -1 EPERM (Operation not permitted)
write(2, "setxattr failed: testn", 22setxattr failed: test
The key in use was created using ima-genkey-self.sh from ima-evm-utils repository on SourceForge
I am running these commands as root. (Without root also IMA attributes cannot be set.)
I am not sure in which places to look for possible reasons for these failures.
linux security
edited Mar 6 at 15:51
Rui F Ribeiro
41.9k1483142
asked Mar 6 at 15:30
imaevm_beginnerimaevm_beginner
11
I want to enable IMA and EVM on an embedded device based on Debian.
I've installed evmctl (ima-evm-utils) on the machine.
The boot parameters related to IMA/EVM are:
ima_policy=tcb ima_appraise_tcb ima_appraise=fix ima_hash=sha256 ima_template=ima-sig evm=fix
Creating IMA hashes via evmctl ima_hash -a sha256 <file> works fine and xattr "security.ima" shows some content.
Also creating IMA signature via evmctl ima_sign -k <keyfile> <file> produces some result.
If it comes to EVM it does not work as good.
If I use evmctl sign -o -k privkey_evm.pem test on the same file I get an error message:
setxattr failed: test
errno: Operation not permitted (1)
With strace I can see this error:
lsetxattr("test", "security.evm", "52 .... 234", 137, 0) = -1 EPERM (Operation not permitted)
write(2, "setxattr failed: testn", 22setxattr failed: test
The key in use was created using ima-genkey-self.sh from ima-evm-utils repository on SourceForge
I am running these commands as root. (Without root also IMA attributes cannot be set.)
I am not sure in which places to look for possible reasons for these failures.
linux security
linux security
edited Mar 6 at 15:51
Rui F Ribeiro
41.9k1483142
asked Mar 6 at 15:30
imaevm_beginnerimaevm_beginner
11
edited Mar 6 at 15:51
Rui F Ribeiro
41.9k1483142
asked Mar 6 at 15:30
imaevm_beginnerimaevm_beginner
11
edited Mar 6 at 15:51
Rui F Ribeiro
41.9k1483142
edited Mar 6 at 15:51
Rui F Ribeiro
41.9k1483142
edited Mar 6 at 15:51
Rui F Ribeiro
41.9k1483142
41.9k1483142
asked Mar 6 at 15:30
imaevm_beginnerimaevm_beginner
11
asked Mar 6 at 15:30
imaevm_beginnerimaevm_beginner
11
asked Mar 6 at 15:30
imaevm_beginnerimaevm_beginner
11
11
add a comment |
add a comment |
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