b3bc3d7925
Submitted by: aniketp Reviewed by: csjp (earlier version) MFC after: 2 weeks Sponsored by: Google, Inc. (GSoC 2018) Differential Revision: https://reviews.freebsd.org/D15618
174 lines
5.0 KiB
Groff
174 lines
5.0 KiB
Groff
.\"-
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.\" Copyright (c) 2009 Apple, Inc.
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.\" Copyright (c) 2005 Robert N. M. Watson
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd May 30, 2018
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.Dt AU_IO 3
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.Os
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.Sh NAME
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.Nm au_fetch_tok ,
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.Nm au_print_tok ,
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.Nm au_print_flags_tok ,
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.Nm au_read_rec
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.Nd "perform I/O involving an audit record"
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.Sh LIBRARY
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.Lb libbsm
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.Sh SYNOPSIS
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.In bsm/libbsm.h
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.Ft int
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.Fn au_fetch_tok "tokenstr_t *tok" "u_char *buf" "int len"
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.Ft void
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.Fo au_print_tok
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.Fa "FILE *outfp" "tokenstr_t *tok" "char *del" "char raw" "char sfrm"
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.Fc
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.Ft void
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.Fo au_print_flags_tok
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.Fa "FILE *outfp" "tokenstr_t *tok" "char *del" "int oflags"
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.Fc
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.Ft int
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.Fn au_read_rec "FILE *fp" "u_char **buf"
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.Sh DESCRIPTION
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These interfaces support input and output (I/O) involving audit records,
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internalizing an audit record from a byte stream, converting a token to
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either a raw or default string, and reading a single record from a file.
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.Pp
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The
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.Fn au_fetch_tok
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function
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reads a token from the passed buffer
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.Fa buf
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of length
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.Fa len
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bytes, and returns a pointer to the token via
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.Fa tok .
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.Pp
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The
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.Fn au_print_tok
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function
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prints a string form of the token
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.Fa tok
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to the file output stream
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.Fa outfp ,
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either in default mode, or raw mode if
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.Fa raw
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is set non-zero.
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The delimiter
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.Fa del
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is used when printing.
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The
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.Fn au_print_flags_tok
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function is a replacement for
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.Fn au_print_tok .
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The
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.Fa oflags
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controls how the output should be formatted and is specified by
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or'ing the following flags:
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.Pp
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.Bl -tag -width AU_OFLAG_NORESOLVE -compact -offset indent
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.It Li AU_OFLAG_NONE
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Use the default form.
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.It Li AU_OFLAG_NORESOLVE
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Leave user and group IDs in their numeric form.
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.It Li AU_OFLAG_RAW
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Use the raw, numeric form.
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.It Li AU_OFLAG_SHORT
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Use the short form.
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.It Li AU_OFLAG_XML
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Use the XML form.
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.El
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.Pp
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The flags options AU_OFLAG_SHORT and AU_OFLAG_RAW are exclusive and
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should not be used together.
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.Pp
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The
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.Fn au_read_rec
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function
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reads an audit record from the file stream
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.Fa fp ,
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and returns an allocated memory buffer containing the record via
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.Fa *buf ,
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which must be freed by the caller using
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.Xr free 3 .
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.Pp
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A typical use of these routines might open a file with
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.Xr fopen 3 ,
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then read records from the file sequentially by calling
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.Fn au_read_rec .
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Each record would be broken down into components tokens through sequential
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calls to
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.Fn au_fetch_tok
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on the buffer, and then invoking
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.Fn au_print_flags_tok
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to print each token to an output stream such as
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.Dv stdout .
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On completion of the processing of each record, a call to
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.Xr free 3
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would be used to free the record buffer.
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Finally, the source stream would be closed by a call to
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.Xr fclose 3 .
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.Sh RETURN VALUES
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On success,
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.Fn au_fetch_tok
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returns 0 while
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.Fn au_read_rec
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returns the number of bytes read.
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Both functions return \-1 on failure with
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.Va errno
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set appropriately.
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.Sh SEE ALSO
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.Xr free 3 ,
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.Xr libbsm 3
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.Sh HISTORY
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The OpenBSM implementation was created by McAfee Research, the security
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division of McAfee Inc., under contract to Apple Computer, Inc., in 2004.
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It was subsequently adopted by the TrustedBSD Project as the foundation for
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the OpenBSM distribution.
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.Pp
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The
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.Fn au_print_flags_tok
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function was added by Stacey Son as a replacement for the
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.Fn au_print_tok
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so new output formatting flags can be easily added without changing the API.
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The
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.Fn au_print_tok
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is obsolete but remains in the API to support legacy code.
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.Sh AUTHORS
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.An -nosplit
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This software was created by
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.An Robert Watson ,
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.An Wayne Salamon ,
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and
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.An Suresh Krishnaswamy
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for McAfee Research, the security research division of McAfee,
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Inc., under contract to Apple Computer, Inc.
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.Pp
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The Basic Security Module (BSM) interface to audit records and audit event
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stream format were defined by Sun Microsystems.
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.Sh BUGS
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The
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.Va errno
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variable
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may not always be properly set in the event of an error.
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