1security_compute_av(3) SELinux API documentation security_compute_av(3)
2
6 security_compute_av, security_compute_av_flags, security_compute_cre‐
7 ate, security_compute_create_name, security_compute_relabel, secu‐
8 rity_compute_member, security_compute_user, security_validatetrans,
9 security_get_initial_context - query the SELinux policy database in the
10 kernel
11
13 #include <selinux/selinux.h>
14 int security_compute_av(char *scon, char *tcon, security_class_t
16 tclass, access_vector_t requested, struct av_decision *avd);
17 int security_compute_av_raw(char *scon, char *tcon, security_class_t
19 tclass, access_vector_t requested, struct av_decision *avd);
20 int security_compute_av_flags(char *scon, char *tcon, security_class_t
22 tclass, access_vector_t requested, struct av_decision *avd);
23 int security_compute_av_flags_raw(char *scon, char *tcon, secu‐
25 rity_class_t tclass, access_vector_t requested, struct av_decision
26 *avd);
27 int security_compute_create(char *scon, char *tcon, security_class_t
29 tclass, char **newcon);
30 int security_compute_create_raw(char *scon, char *tcon, secu‐
32 rity_class_t tclass, char **newcon);
33 int security_compute_create_name(char *scon, char *tcon, secu‐
35 rity_class_t tclass, const char *objname, char **newcon);
36 int security_compute_create_name_raw(char *scon, char *tcon, secu‐
38 rity_class_t tclass, const char *objname, char **newcon);
39 int security_compute_relabel(char *scon, char *tcon, security_class_t
41 tclass, char **newcon);
42 int security_compute_relabel_raw(char *scon, char *tcon, secu‐
44 rity_class_t tclass, char **newcon);
45 int security_compute_member(char *scon, char *tcon, security_class_t
47 tclass, char **newcon);
48 int security_compute_member_raw(char *scon, char *tcon, secu‐
50 rity_class_t tclass, char **newcon);
51 int security_compute_user(char *scon, const char *username, char
53 ***con);
54 int security_compute_user_raw(char *scon, const char *username, char
56 ***con);
57 int security_validatetrans(char *scon, const char *tcon, secu‐
59 rity_class_t tclass, char *newcon);
60 int security_validatetrans_raw(char *scon, const char *tcon, secu‐
62 rity_class_t tclass, char *newcon);
63 int security_get_initial_context(const char *name, char **con);
65 int security_get_initial_context_raw(const char *name, char **con);
67 int selinux_check_access(const char *scon, const char *tcon, const char
69 *class, const char *perm, void *auditdata);
70 int selinux_check_passwd_access(access_vector_t requested);
72 int checkPasswdAccess(access_vector_t requested);
74
76 security_compute_av() queries whether the policy permits the source
77 context scon to access the target context tcon via class tclass with
78 the requested access vector. The decision is returned in avd.
79 security_compute_av_flags() is identical to security_compute_av but
81 additionally sets the flags field of avd. Currently one flag is sup‐
82 ported: SELINUX_AVD_FLAGS_PERMISSIVE, which indicates the decision is
83 computed on a permissive domain.
84 security_compute_create() is used to compute a context to use for
86 labeling a new object in a particular class based on a SID pair.
87 security_compute_create_name() is identical to
89 security_compute_create() but also takes name of the new object in cre‐
90 ation as an argument. When TYPE_TRANSITION rule on the given class and
91 a SID pair has object name extension, we shall be able to obtain a cor‐
92 rect newcon according to the security policy. Note that this interface
93 is only supported on the linux 2.6.40 or later. In the older kernel,
94 the object name will be simply ignored.
95 security_compute_relabel() is used to compute the new context to use
97 when relabeling an object, it is used in the pam_selinux.so source and
98 the newrole source to determine the correct label for the tty at login
99 time, but can be used for other things.
100 security_compute_member() is used to compute the context to use when
102 labeling a polyinstantiated object instance.
103 security_compute_user() is used to determine the set of user contexts
105 that can be reached from a source context. It is mainly used by
106 get_ordered_context_list().
107 security_validatetrans() is used to determine if a transition from scon
109 to newcon using tcon as the object is valid for object class tclass.
110 This checks against the mlsvalidatetrans and validatetrans constraints
111 in the loaded policy. Returns 0 if allowed, and -1 if an error occurred
112 with errno set.
113 security_get_initial_context() is used to get the context of a kernel
115 initial security identifier specified by name
116 security_compute_av_raw(), security_compute_av_flags_raw(),
118 security_compute_create_raw(), security_compute_create_name_raw(),
119 security_compute_relabel_raw(), security_compute_member_raw(),
120 security_compute_user_raw() security_validatetrans_raw() and
121 security_get_initial_context_raw() behave identically to their non-raw
122 counterparts but do not perform context translation.
123 selinux_check_access() is used to check if the source context has the
125 access permission for the specified class on the target context.
126 selinux_check_passwd_access() is used to check for a permission in the
128 passwd class. selinux_check_passwd_access() uses getprevcon() for the
129 source and target security contexts.
130 checkPasswdAccess() is a deprecated alias of the
132 selinux_check_passwd_access() function.
133
135 Returns zero on success or -1 on error.
136
138 selinux(8), getcon(3), getfilecon(3), get_ordered_context_list(3)
139russell@coker.com.au 1 January 2004 security_compute_av(3)