kernel/linux.git/security/apparmor/include/net.h, branch v6.18.21

apparmor: make sure unix socket labeling is correctly updated.

2025-07-20T09:19:27+00:00

When a unix socket is passed into a different confinement domain make sure its cached mediation labeling is updated to correctly reflect which domains are using the socket. Fixes: c05e705812d1 ("apparmor: add fine grained af_unix mediation") Signed-off-by: John Johansen

apparmor: add fine grained af_unix mediation

2025-01-18T14:47:12+00:00

Extend af_unix mediation to support fine grained controls based on the type (abstract, anonymous, fs), the address, and the labeling on the socket. This allows for using socket addresses to label and the socket and control which subjects can communicate. The unix rule format follows standard apparmor rules except that fs based unix sockets can be mediated by existing file rules. None fs unix sockets can be mediated by a unix socket rule. Where The address of an abstract unix domain socket begins with the @ character, similar to how they are reported (as paths) by netstat -x. The address then follows and may contain pattern matching and any characters including the null character. In apparmor null characters must be specified by using an escape sequence \000 or \x00. The pattern matching is the same as is used by file path matching so * will not match / even though it has no special meaning with in an abstract socket name. Eg. allow unix addr=@*, Autobound unix domain sockets have a unix sun_path assigned to them by the kernel, as such specifying a policy based address is not possible. The autobinding of sockets can be controlled by specifying the special auto keyword. Eg. allow unix addr=auto, To indicate that the rule only applies to auto binding of unix domain sockets. It is important to note this only applies to the bind permission as once the socket is bound to an address it is indistinguishable from a socket that have an addr bound with a specified name. When the auto keyword is used with other permissions or as part of a peer addr it will be replaced with a pattern that can match an autobound socket. Eg. For some kernels allow unix rw addr=auto, It is important to note, this pattern may match abstract sockets that were not autobound but have an addr that fits what is generated by the kernel when autobinding a socket. Anonymous unix domain sockets have no sun_path associated with the socket address, however it can be specified with the special none keyword to indicate the rule only applies to anonymous unix domain sockets. Eg. allow unix addr=none, If the address component of a rule is not specified then the rule applies to autobind, abstract and anonymous sockets. The label on the socket can be compared using the standard label= rule conditional. Eg. allow unix addr=@foo peer=(label=bar), see man apparmor.d for full syntax description. Signed-off-by: John Johansen

apparmor: in preparation for finer networking rules rework match_prot

2025-01-18T14:47:12+00:00

Rework match_prot into a common fn that can be shared by all the networking rules. This will provide compatibility with current socket mediation, via the early bailout permission encoding. Signed-off-by: John Johansen

apparmor: remove af_select macro

2025-01-18T14:47:12+00:00

The af_select macro just adds a layer of unnecessary abstraction that makes following what the code is doing harder. Signed-off-by: John Johansen

lsm: infrastructure management of the sock security

2024-07-29T20:54:50+00:00

Move management of the sock->sk_security blob out of the individual security modules and into the security infrastructure. Instead of allocating the blobs from within the modules the modules tell the infrastructure how much space is required, and the space is allocated there. Acked-by: Paul Moore Reviewed-by: Kees Cook Reviewed-by: John Johansen Acked-by: Stephen Smalley Signed-off-by: Casey Schaufler [PM: subject tweak] Signed-off-by: Paul Moore

apparmor: pass cred through to audit info.

2023-10-18T22:30:38+00:00

The cred is needed to properly audit some messages, and will be needed in the future for uid conditional mediation. So pass it through to where the apparmor_audit_data struct gets defined. Reviewed-by: Georgia Garcia Signed-off-by: John Johansen

apparmor: combine common_audit_data and apparmor_audit_data

2023-10-18T22:30:29+00:00

Everywhere where common_audit_data is used apparmor audit_data is also used. We can simplify the code and drop the use of the aad macro everywhere by combining the two structures. Reviewed-by: Georgia Garcia Signed-off-by: John Johansen

apparmor: rename SK_CTX() to aa_sock and make it an inline fn

2023-10-18T22:29:55+00:00

In preparation for LSM stacking rework the macro to an inline fn Reviewed-by: Georgia Garcia Signed-off-by: John Johansen

apparmor: remove unused macro

2023-07-10T00:31:11+00:00

SOCK_ctx() doesn't seem to be used anywhere in the code, so remove it. Signed-off-by: GONG, Ruiqi Signed-off-by: John Johansen

apparmor: add mediation class information to auditing

2022-10-03T21:49:03+00:00

Audit messages currently don't contain the mediation class which can make them less clear than they should be in some circumstances. With newer mediation classes coming this potential confusion will become worse. Fix this by adding the mediatin class to the messages. Signed-off-by: John Johansen