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https://github.com/SELinuxProject/selinux
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9c46a0a315
Some programs, like passwd, need to do simeple one time access checks. Rather than set up a full avc cache and use that infrastructure they were directly using security_compute_av. A problem with this approach is the lack of audit on denials. This patch creates a new interface that is simple to use and which will still listen to things like permissive and output audit messages on denials. Signed-off-by: Eric Paris <eparis@redhat.com> Acked-by: Dan Walsh <dwalsh@redhat.com>
99 lines
3.5 KiB
Groff
99 lines
3.5 KiB
Groff
.TH "security_compute_av" "3" "1 January 2004" "russell@coker.com.au" "SELinux API documentation"
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.SH "NAME"
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security_compute_av, security_compute_av_flags, security_compute_create, security_compute_relabel,
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security_compute_member, security_compute_user, security_get_initial_context \- query
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the SELinux policy database in the kernel.
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.SH "SYNOPSIS"
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.B #include <selinux/selinux.h>
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.B #include <selinux/flask.h>
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.sp
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.BI "int security_compute_av(security_context_t "scon ", security_context_t "tcon ", security_class_t "tclass ", access_vector_t "requested ", struct av_decision *" avd );
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.sp
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.BI "int security_compute_av_flags(security_context_t "scon ", security_context_t "tcon ", security_class_t "tclass ", access_vector_t "requested ", struct av_decision *" avd );
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.sp
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.BI "int security_compute_create(security_context_t "scon ", security_context_t "tcon ", security_class_t "tclass ", security_context_t *" newcon );
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.sp
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.BI "int security_compute_relabel(security_context_t "scon ", security_context_t "tcon ", security_class_t "tclass ", security_context_t *" newcon );
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.sp
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.BI "int security_compute_member(security_context_t "scon ", security_context_t "tcon ", security_class_t "tclass ", security_context_t *" newcon );
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.sp
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.BI "int security_compute_user(security_context_t "scon ", const char *" username ", security_context_t **" con );
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.sp
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.BI "int security_get_initial_context(const char *" name ", security_context_t
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"con );
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.sp
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.BI "int selinux_check_access(const security_context_t " scon, " const security_context_t " tcon, " const char *" class, " const char *" perm, "void *" auditdata);
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.sp
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.BI "int selinux_check_passwd_access(access_vector_t " requested );
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.sp
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.BI "int checkPasswdAccess(access_vector_t " requested );
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.SH "DESCRIPTION"
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.B security_compute_av
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queries whether the policy permits the source context
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.B scon
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to access the target context
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.B tcon
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via class
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.B tclass
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with the
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.B requested
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access vector. The decision is returned in
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.BR avd .
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.B security_compute_av_flags
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is identical to
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.B security_compute_av
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but additionally sets the
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.B flags
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field of
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.BR avd .
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Currently one flag is supported:
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.BR SELINUX_AVD_FLAGS_PERMISSIVE ,
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which indicates the decision is computed on a permissive domain.
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.B security_compute_create
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is used to compute a context to use for labeling a new object in a particular
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class based on a SID pair.
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.B security_compute_relabel
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is used to compute the new context to use when relabeling an object, it is used
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in the pam_selinux.so source and the newrole source to determine the correct
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label for the tty at login time, but can be used for other things.
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.B security_compute_member
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is used to compute the context to use when labeling a polyinstantiated object
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instance.
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.B security_compute_user
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is used to determine the set of user contexts that can be reached from a
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source context. It is mainly used by
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.B get_ordered_context_list.
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.B security_get_initial_context
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is used to get the context of a kernel initial security identifier specified by
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.I name
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.B selinux_check_access
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is used to check if the source context has the access permission for the specified class on the target context.
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.B selinux_check_passwd_access
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is used to check for a permission in the
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.I passwd
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class.
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.B selinux_check_passwd_access
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uses getprevcon() for the source and target security contexts.
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.B checkPasswdAccess
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is a deprecated alias of the
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.B selinux_check_passwd_access
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function.
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.SH "RETURN VALUE"
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Returns zero on success or \-1 on error.
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.SH "SEE ALSO"
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.BR selinux "(8), " getcon "(3), " getfilecon "(3), " get_ordered_context_list "(3)"
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