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Configuring whether pam_fscrypt drops caches or not isn't really
something the user should have to do, and it's also irrelevant for v2
encryption policies (the default on newer systems). It's better to have
pam_fscrypt automatically decide whether it needs to drop caches or not.
Do this by making pam_fscrypt check whether any encryption policy keys
are being removed from a user keyring (rather than from a filesystem
keyring). If so, it drops caches; otherwise it doesn't. This
supersedes the "drop_caches" option, which won't do anything anymore.
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Services launched by systemd user sessions on Debian / Ubuntu systems
are often not able to access the home directory, because there is no
guarantee / requirement that pam_fscrypt is sequenced before
pam_systemd.
Although this pam-config mechanism is Debian-specific, the config file
is provided here upstream and unmodified in Debian. Raising the
priority here so that it's always ordered ahead of pam_systemd will
solve issues such as https://github.com/google/fscrypt/issues/270,
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=964951 and
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1889416.
After a survey of pam-config files available in Debian bullseye, the
value of 100 was chosen as it appears after most other plugins that
could be involved in more explicit homedir configuration (eg pam_mount
at 128) but before those which seem unlikely to work without a home
directory (eg pam_ssh at 64).
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Allow overriding the mountpoint where login protectors are stored by
setting the FSCRYPT_ROOT_MNT environmental variable. The CLI tests need
this to avoid touching the real "/".
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Allow root to provide the --all-users option to 'fscrypt lock' to force
an encryption key to be removed from the filesystem (i.e., force an
encrypted directory to be locked), even if other users have added it.
To implement this option, we just need to use the
FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS ioctl rather than
FS_IOC_REMOVE_ENCRYPTION_KEY.
In theory this option could be implemented for the user keyrings case
too, but it would be difficult and the user keyrings are being
deprecated for fscrypt, so don't bother.
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Implement adding/removing v2 encryption policy keys to/from the kernel.
The kernel requires that the new ioctls FS_IOC_ADD_ENCRYPTION_KEY and
FS_IOC_REMOVE_ENCRYPTION_KEY be used for this. Root is not required.
However, non-root support brings an extra complication: the kernel keeps
track of which users have called FS_IOC_ADD_ENCRYPTION_KEY for the same
key. FS_IOC_REMOVE_ENCRYPTION_KEY only works as one of these users, and
it only removes the calling user's claim to the key; the key is only
truly removed when the last claim is removed.
Implement the following behavior:
- 'fscrypt unlock' and pam_fscrypt add the key for the user, even if
other user(s) have it added already. This behavior is needed so that
another user can't remove the key out from under the user.
- 'fscrypt lock' and pam_fscrypt remove the key for the user. However,
if the key wasn't truly removed because other users still have it
added, 'fscrypt lock' prints a warning.
- 'fscrypt status' shows whether the directory is unlocked for anyone.
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FS_IOC_ADD_ENCRYPTION_KEY and FS_IOC_REMOVE_ENCRYPTION_KEY require root
for v1 policy keys, so update the PAM module to re-acquire root
privileges while provisioning/deprovisioning policies that need this.
Also, only set up the user keyring if it will actually be used.
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These were found by a combination of manual review and a custom script
that checks for common errors.
Also removed an outdated sentence from the comment for setupBefore().
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Per the FHS, manually installed programs should go under /usr/local.
This change also makes it easier to change the global installation
prefix. For example, package managers should set PREFIX=/usr
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Running "go vet -shadow ./..." finds all places where a variable might
be incorrectly or unnecessarily shadowed. This fixes some of them.
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Our current build tags set off the linter. We will later add in more
comprehensive build tags that will be properly formatted.
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Now the offending panic will just be logged and the module will fail.
This is important as to not crash the login process.
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