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In attempting to enable building various part of Android with -Wall -Werror, we found that the const security_context_t declarations in libselinux are incorrect; const char * was intended, but const security_context_t translates to char * const and triggers warnings on passing const char * from the caller. Easiest fix is to replace them all with const char *. And while we are at it, just get rid of all usage of security_context_t itself as it adds no value - there is no true encapsulation of the security context strings and callers already directly use string functions on them. typedef left to permit building legacy users until such a time as all are updated. This is a port of Change-Id I2f9df7bb9f575f76024c3e5f5b660345da2931a7 from Android, augmented to deal with all of the other code in upstream libselinux and updating the man pages too. Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov> Acked-by: Eric Paris <eparis@redhat.com>
106 lines
2.9 KiB
Groff
106 lines
2.9 KiB
Groff
.TH "getexeccon" "3" "1 January 2004" "russell@coker.com.au" "SELinux API documentation"
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.SH "NAME"
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getexeccon, setexeccon \- get or set the SELinux security context used for executing a new process
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rpm_execcon \- run a helper for rpm in an appropriate security context
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.
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.SH "SYNOPSIS"
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.B #include <selinux/selinux.h>
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.sp
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.BI "int getexeccon(char **" context );
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.sp
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.BI "int getexeccon_raw(char **" context );
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.sp
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.BI "int setexeccon(char * "context );
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.sp
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.BI "int setexeccon_raw(char * "context );
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.sp
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.BI "int setexecfilecon(const char *" filename ", const char *" fallback_type );
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.sp
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.BI "int rpm_execcon(unsigned int " verified ", const char *" filename ", char *const " argv "[] , char *const " envp "[]);
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.
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.SH "DESCRIPTION"
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.BR getexeccon ()
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retrieves the context used for executing a new process.
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This returned context should be freed with
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.BR freecon (3)
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if non-NULL.
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.BR getexeccon ()
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sets
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.BI * context
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to NULL if no exec context has been explicitly
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set by the program (i.e. using the default policy behavior).
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.BR setexeccon ()
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sets the context used for the next
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.BR execve (2)
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call.
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NULL can be passed to
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.BR setexeccon ()
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to reset to the default policy behavior.
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The exec context is automatically reset after the next
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.BR execve (2),
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so a program doesn't need to explicitly sanitize it upon startup.
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.BR setexeccon ()
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can be applied prior to library
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functions that internally perform an
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.BR execve (2),
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e.g.
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.BR execl *(3),
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.BR execv *(3),
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.BR popen (3),
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in order to set an exec context for that operation.
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.BR getexeccon_raw ()
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and
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.BR setexeccon_raw ()
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behave identically to their non-raw counterparts but do not perform context
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translation.
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.B Note:
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Signal handlers that perform an
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.BR execve (2)
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must take care to
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save, reset, and restore the exec context to avoid unexpected behavior.
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.BR setexecfilecon ()
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sets the context used for the next
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.BR execve (2)
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call, based on the policy for the
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.IR filename ,
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and falling back to a new context with a
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.I fallback_type
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in case there is no transition.
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.BR rpm_execcon ()
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is deprecated; please use
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.BR setexecfilecon ()
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in conjunction with
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.BR execve (2)
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in all new code. This function
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runs a helper for rpm in an appropriate security context. The
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verified parameter should contain the return code from the signature
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verification (0 == ok, 1 == notfound, 2 == verifyfail, 3 ==
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nottrusted, 4 == nokey), although this information is not yet used by
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the function. The function determines the proper security context for
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the helper based on policy, sets the exec context accordingly, and
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then executes the specified filename with the provided argument and
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environment arrays.
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.
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.SH "RETURN VALUE"
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On error \-1 is returned.
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On success
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.BR getexeccon (),
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.BR setexeccon ()
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and
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.BR setexecfilecon ()
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return 0.
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.BR rpm_execcon ()
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only returns upon errors, as it calls
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.BR execve (2).
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.
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.SH "SEE ALSO"
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.BR selinux "(8), " freecon "(3), " getcon "(3)"
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