NAME¶

aa_getprocattr_raw, aa_getprocattr - read and parse procattr data

aa_getcon, aa_gettaskcon - get task confinement information

aa_getpeercon - get the confinement of a socket's other end (peer)

SYNOPSIS¶

#include <sys/apparmor.h>

int aa_getprocattr_raw(pid_t tid, const char *attr, char *buf, int len, char **mode);

int aa_getprocattr(pid_t tid, const char *attr, char **label, char **mode);

int aa_gettaskcon(pid_t target, char **label, char **mode);

int aa_getcon(char **label, char **mode);

int aa_getpeercon_raw(int fd, char *buf, int *len, char **mode);

int aa_getpeercon(int fd, char **label, char **mode);

Link with -lapparmor when compiling.

DESCRIPTION¶

The aa_getcon function gets the current AppArmor confinement context for the current task. The confinement context consists of a label and a mode. The label is usually just the name of the AppArmor profile restricting the task, but it may include the profile namespace or in some cases a set of profile names (known as a stack of profiles). The mode is a string that describes how the kernel is enforcing the policy defined in the profile. Profiles loaded in "enforce" mode will result in enforcement of the policy defined in the profile as well as reporting policy violation attempts. Profiles in "complain" mode will not enforce policy but instead report policy violation attempts.

Some examples of possible returned *label strings are "unconfined", "/sbin/dhclient", and "Firefox". The string can consist of any non-NUL characters but it will be NUL-terminated. The *label string must be freed using free().

The possible *mode strings are "enforce" and "complain". Additionally, *mode may be NULL when *label is "unconfined". The *mode string must not be freed. The *label and *mode strings come from a single buffer allocation and are separated by a NUL character.

The aa_gettaskcon function is like the aa_getcon function except it will work for any arbitrary task in the system.

The aa_getpeercon function is similar to that of aa_gettaskcon except that it returns the confinement information for task on the other end of a socket connection.

The aa_getpeercon_raw function is the backend for the aa_getpeercon function and does not handle buffer allocation.

The aa_getprocattr function is the backend for the aa_getcon and aa_gettaskcon functions and handles the reading and parsing of the confinement data from different arbitrary attr files and returns the processed results in an allocated buffer.

The aa_getprocattr_raw() is the backend for the aa_getprocattr function and does not handle buffer allocation.

RETURN VALUE¶

On success size of data placed in the buffer is returned, this includes the mode if present and any terminating characters. On error, -1 is returned, and errno(3) is set appropriately.

ERRORS¶

EINVAL

The apparmor kernel module is not loaded or the communication via the /proc/*/attr/file did not conform to protocol.

ENOMEM

Insufficient kernel memory was available.

EACCES

Access to the specified file/task was denied.

ENOENT

The specified file/task does not exist or is not visible.

ERANGE

The confinement data is too large to fit in the supplied buffer.

ENOPROTOOPT

The kernel doesn't support the SO_PEERLABEL option in sockets. This happens mainly when the kernel lacks 'fine grained unix mediation' support. It also can happen on LSM stacking kernels where another LSM has claimed this interface and decides to return this error, although this is really a corner case.

NOTES¶

If aa_getpeercon_raw returns -1 and errno is ERANGE, the value of *len can be used to reallocate buf so that it is sufficiently large enough to store the confinement data.

BUGS¶

None known. If you find any, please report them at <https://gitlab.com/apparmor/apparmor/-/issues>.

SEE ALSO¶

apparmor(7), apparmor.d(5), apparmor_parser(8), aa_change_profile(2), aa_splitcon(3) and <https://wiki.apparmor.net>.