Merge OpenBSM alpha 4 from OpenBSM vendor branch to head, both

contrib/openbsm (svn merge) and src/sys/{bsm,security/audit} (manual
merge).  Add libauditd build parts and add to auditd's linkage;
force libbsm to build before libauditd.

OpenBSM history for imported revisions below for reference.

MFC after:      1 month
Sponsored by:   Apple Inc.
Obtained from:  TrustedBSD Project

OpenBSM 1.1 alpha 4

- With the addition of BSM error number mapping, we also need to map the
  local error number passed to audit_submit(3) to a BSM error number,
  rather than have the caller perform that conversion.
- Reallocate user audit events to avoid collisions with Solaris; adopt a
  more formal allocation scheme, and add some events allocated in Solaris
  that will be of immediate use on other platforms.
- Add an event for Calife.
- Add au_strerror(3), which allows generating strings for BSM errors
  directly, rather than requiring applications to map to the local error
  space, which might not be able to entirely represent the BSM error
  number space.
- Major auditd rewrite for launchd(8) support.  Add libauditd library
  that is shared between launchd and auditd.
- Add AUDIT_TRIGGER_INITIALIZE trigger (sent via 'audit -i') for
  (re)starting auditing under launchd(8) on Mac OS X.
- Add 'current' symlink to active audit trail.
- Add crash recovery of previous audit trail file when detected on audit
  startup that it has not been properly terminated.
- Add the event AUE_audit_recovery to indicated when an audit trail file
  has been recovered from not being properly terminated.  This event is
  stored in the new audit trail file and includes the path of recovered
  audit trail file.
- Mac OS X and FreeBSD dependent code in auditd.c is separated into
  auditd_darwin.c and auditd_fbsd.c files.
- Add an event for the posix_spawn(2) and fsgetpath(2) Mac OS X system
  calls.
- For Mac OS X, we use ASL(3) instead of syslog(3) for logging.
- Add support for NOTICE level logging.

OpenBSM 1.1 alpha 3

- Add two new functions, au_bsm_to_errno() and au_errno_to_bsm(), to map
  between BSM error numbers (largely the Solaris definitions) and local
  errno(2) values for 32-bit and 64-bit return tokens.  This is required
  as operating systems don't agree on some of the values of more recent
  error numbers.
- Fix a bug how au_to_exec_args(3) and au_to_exec_env(3) calculates the
  total size for the token.  This buge.
- Deprecated Darwin constants, such as TRAILER_PAD_MAGIC, removed.

1 files changed, 642 insertions, 0 deletions

diff --git a/sys/security/audit/audit_bsm_errno.c b/sys/security/audit/audit_bsm_errno.c
new file mode 100644
index 0000000..7586213
--- /dev/null
+++ b/sys/security/audit/audit_bsm_errno.c
@@ -0,0 +1,642 @@
+/*-
+ * Copyright (c) 2008 Apple Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ * 2.  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE. 
+ *
+ * P4: //depot/projects/trustedbsd/openbsm/libbsm/bsm_errno.c#12
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+
+#include <bsm/audit_errno.h>
+#include <bsm/libbsm.h>
+
+#include <sys/errno.h>
+
+/*
+ * Different operating systems use different numeric constants for different
+ * error numbers, and sometimes error numbers don't exist in more than one
+ * operating system.  These routines convert between BSM and local error
+ * number spaces, subject to the above realities.  BSM error numbers are
+ * stored in a single 8-bit character, so don't have a byte order.
+ */
+
+struct bsm_errors {
+	int		 be_bsm_error;
+	int		 be_os_error;
+	const char	*be_strerror;
+};
+
+#define	ERRNO_NO_LOCAL_MAPPING	-600
+
+/*
+ * Mapping table -- please maintain in numeric sorted order with respect to
+ * the BSM constant.  Today we do a linear lookup, but could switch to a
+ * binary search if it makes sense.  We only ifdef errors that aren't
+ * generally available, but it does make the table a lot more ugly.
+ *
+ * XXXRW: It would be nice to have a similar ordered table mapping to BSM
+ * constant from local constant, but the order of local constants varies by
+ * OS.  Really we need to build that table at compile-time but don't do that
+ * yet.
+ *
+ * XXXRW: We currently embed English-language error strings here, but should
+ * support catalogues; these are only used if the OS doesn't have an error
+ * string using strerror(3).
+ */
+static const struct bsm_errors bsm_errors[] = {
+	{ BSM_ESUCCESS, 0, "Success" },
+	{ BSM_EPERM, EPERM, "Operation not permitted" },
+	{ BSM_ENOENT, ENOENT, "No such file or directory" },
+	{ BSM_ESRCH, ESRCH, "No such process" },
+	{ BSM_EINTR, EINTR, "Interrupted system call" },
+	{ BSM_EIO, EIO, "Input/output error" },
+	{ BSM_ENXIO, ENXIO, "Device not configured" },
+	{ BSM_E2BIG, E2BIG, "Argument list too long" },
+	{ BSM_ENOEXEC, ENOEXEC, "Exec format error" },
+	{ BSM_EBADF, EBADF, "BAd file descriptor" },
+	{ BSM_ECHILD, ECHILD, "No child processes" },
+	{ BSM_EAGAIN, EAGAIN, "Resource temporarily unavailable" },
+	{ BSM_ENOMEM, ENOMEM, "Cannot allocate memory" },
+	{ BSM_EACCES, EACCES, "Permission denied" },
+	{ BSM_EFAULT, EFAULT, "Bad address" },
+	{ BSM_ENOTBLK, ENOTBLK, "Block device required" },
+	{ BSM_EBUSY, EBUSY, "Device busy" },
+	{ BSM_EEXIST, EEXIST, "File exists" },
+	{ BSM_EXDEV, EXDEV, "Cross-device link" },
+	{ BSM_ENODEV, ENODEV, "Operation not supported by device" },
+	{ BSM_ENOTDIR, ENOTDIR, "Not a directory" },
+	{ BSM_EISDIR, EISDIR, "Is a directory" },
+	{ BSM_EINVAL, EINVAL, "Invalid argument" },
+	{ BSM_ENFILE, ENFILE, "Too many open files in system" },
+	{ BSM_EMFILE, EMFILE, "Too many open files" },
+	{ BSM_ENOTTY, ENOTTY, "Inappropriate ioctl for device" },
+	{ BSM_ETXTBSY, ETXTBSY, "Text file busy" },
+	{ BSM_EFBIG, EFBIG, "File too large" },
+	{ BSM_ENOSPC, ENOSPC, "No space left on device" },
+	{ BSM_ESPIPE, ESPIPE, "Illegal seek" },
+	{ BSM_EROFS, EROFS, "Read-only file system" },
+	{ BSM_EMLINK, EMLINK, "Too many links" },
+	{ BSM_EPIPE, EPIPE, "Broken pipe" },
+	{ BSM_EDOM, EDOM, "Numerical argument out of domain" },
+	{ BSM_ERANGE, ERANGE, "Result too large" },
+	{ BSM_ENOMSG, ENOMSG, "No message of desired type" },
+	{ BSM_EIDRM, EIDRM, "Identifier removed" },
+	{ BSM_ECHRNG,
+#ifdef ECHRNG
+	ECHRNG,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Channel number out of range" },
+	{ BSM_EL2NSYNC,
+#ifdef EL2NSYNC
+	EL2NSYNC,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Level 2 not synchronized" },
+	{ BSM_EL3HLT,
+#ifdef EL3HLT
+	EL3HLT,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Level 3 halted" },
+	{ BSM_EL3RST,
+#ifdef EL3RST
+	EL3RST,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Level 3 reset" },
+	{ BSM_ELNRNG,
+#ifdef ELNRNG
+	ELNRNG,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Link number out of range" },
+	{ BSM_EUNATCH,
+#ifdef EUNATCH
+	EUNATCH,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Protocol driver not attached" },
+	{ BSM_ENOCSI,
+#ifdef ENOCSI
+	ENOCSI,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"No CSI structure available" },
+	{ BSM_EL2HLT,
+#ifdef EL2HLT
+	EL2HLT,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Level 2 halted" },
+	{ BSM_EDEADLK, EDEADLK, "Resource deadlock avoided" },
+	{ BSM_ENOLCK, ENOLCK, "No locks available" },
+	{ BSM_ECANCELED, ECANCELED, "Operation canceled" },
+	{ BSM_ENOTSUP, ENOTSUP, "Operation not supported" },
+	{ BSM_EDQUOT, EDQUOT, "Disc quota exceeded" },
+	{ BSM_EBADE,
+#ifdef EBADE
+	EBADE,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Invalid exchange" },
+	{ BSM_EBADR,
+#ifdef EBADR
+	EBADR,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Invalid request descriptor" },
+	{ BSM_EXFULL,
+#ifdef EXFULL
+	EXFULL,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Exchange full" },
+	{ BSM_ENOANO,
+#ifdef ENOANO
+	ENOANO,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"No anode" },
+	{ BSM_EBADRQC,
+#ifdef EBADRQC
+	EBADRQC,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Invalid request descriptor" },
+	{ BSM_EBADSLT,
+#ifdef EBADSLT
+	EBADSLT,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Invalid slot" },
+	{ BSM_EDEADLOCK,
+#ifdef EDEADLOCK
+	EDEADLOCK,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Resource deadlock avoided" },
+	{ BSM_EBFONT,
+#ifdef EBFONT
+	EBFONT,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Bad font file format" },
+	{ BSM_EOWNERDEAD,
+#ifdef EOWNERDEAD
+	EOWNERDEAD,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Process died with the lock" },
+	{ BSM_ENOTRECOVERABLE,
+#ifdef ENOTRECOVERABLE
+	ENOTRECOVERABLE,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Lock is not recoverable" },
+	{ BSM_ENOSTR,
+#ifdef ENOSTR
+	ENOSTR,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Device not a stream" },
+	{ BSM_ENONET,
+#ifdef ENONET
+	ENONET,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Machine is not on the network" },
+	{ BSM_ENOPKG,
+#ifdef ENOPKG
+	ENOPKG,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Package not installed" },
+	{ BSM_EREMOTE, EREMOTE, "Too many levels of remote in path" },
+	{ BSM_ENOLINK,
+#ifdef ENOLINK
+	ENOLINK,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Link has been severed" },
+	{ BSM_EADV,
+#ifdef EADV
+	EADV,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Advertise error" },
+	{ BSM_ESRMNT,
+#ifdef ESRMNT
+	ESRMNT,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"srmount error" },
+	{ BSM_ECOMM,
+#ifdef ECOMM
+	ECOMM,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Communication error on send" },
+	{ BSM_EPROTO,
+#ifdef EPROTO
+	EPROTO,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Protocol error" },
+	{ BSM_ELOCKUNMAPPED,
+#ifdef ELOCKUNMAPPED
+	ELOCKUNMAPPED,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Locked lock was unmapped" },
+	{ BSM_ENOTACTIVE,
+#ifdef ENOTACTIVE
+	ENOTACTIVE,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Facility is not active" },
+	{ BSM_EMULTIHOP,
+#ifdef EMULTIHOP
+	EMULTIHOP,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Multihop attempted" },
+	{ BSM_EBADMSG,
+#ifdef EBADMSG
+	EBADMSG,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Bad message" },
+	{ BSM_ENAMETOOLONG, ENAMETOOLONG, "File name too long" },
+	{ BSM_EOVERFLOW, EOVERFLOW, "Value too large to be stored in data type" },
+	{ BSM_ENOTUNIQ,
+#ifdef ENOTUNIQ
+	ENOTUNIQ,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Given log name not unique" },
+	{ BSM_EBADFD,
+#ifdef EBADFD
+	EBADFD,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Given f.d. invalid for this operation" },
+	{ BSM_EREMCHG,
+#ifdef EREMCHG
+	EREMCHG,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Remote address changed" },
+	{ BSM_ELIBACC,
+#ifdef ELIBACC
+	ELIBACC,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Can't access a needed shared lib" },
+	{ BSM_ELIBBAD,
+#ifdef ELIBBAD
+	ELIBBAD,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Accessing a corrupted shared lib" },
+	{ BSM_ELIBSCN,
+#ifdef ELIBSCN
+	ELIBSCN,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	".lib section in a.out corrupted" },
+	{ BSM_ELIBMAX,
+#ifdef ELIBMAX
+	ELIBMAX,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Attempting to link in too many libs" },
+	{ BSM_ELIBEXEC,
+#ifdef ELIBEXEC
+	ELIBEXEC,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Attempting to exec a shared library" },
+	{ BSM_EILSEQ, EILSEQ, "Illegal byte sequence" },
+	{ BSM_ENOSYS, ENOSYS, "Function not implemented" },
+	{ BSM_ELOOP, ELOOP, "Too many levels of symbolic links" },
+	{ BSM_ERESTART,
+#ifdef ERESTART
+	ERESTART,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Restart syscall" },
+	{ BSM_ESTRPIPE,
+#ifdef ESTRPIPE
+	ESTRPIPE,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"If pipe/FIFO, don't sleep in stream head" },
+	{ BSM_ENOTEMPTY, ENOTEMPTY, "Directory not empty" },
+	{ BSM_EUSERS, EUSERS, "Too many users" },
+	{ BSM_ENOTSOCK, ENOTSOCK, "Socket operation on non-socket" },
+	{ BSM_EDESTADDRREQ, EDESTADDRREQ, "Destination address required" },
+	{ BSM_EMSGSIZE, EMSGSIZE, "Message too long" },
+	{ BSM_EPROTOTYPE, EPROTOTYPE, "Protocol wrong type for socket" },
+	{ BSM_ENOPROTOOPT, ENOPROTOOPT, "Protocol not available" },
+	{ BSM_EPROTONOSUPPORT, EPROTONOSUPPORT, "Protocol not supported" },
+	{ BSM_ESOCKTNOSUPPORT, ESOCKTNOSUPPORT, "Socket type not supported" },
+	{ BSM_EOPNOTSUPP, EOPNOTSUPP, "Operation not supported" },
+	{ BSM_EPFNOSUPPORT, EPFNOSUPPORT, "Protocol family not supported" },
+	{ BSM_EAFNOSUPPORT, EAFNOSUPPORT, "Address family not supported by protocol family" },
+	{ BSM_EADDRINUSE, EADDRINUSE, "Address already in use" },
+	{ BSM_EADDRNOTAVAIL, EADDRNOTAVAIL, "Can't assign requested address" },
+	{ BSM_ENETDOWN, ENETDOWN, "Network is down" },
+	{ BSM_ENETRESET, ENETRESET, "Network dropped connection on reset" },
+	{ BSM_ECONNABORTED, ECONNABORTED, "Software caused connection abort" },
+	{ BSM_ECONNRESET, ECONNRESET, "Connection reset by peer" },
+	{ BSM_ENOBUFS, ENOBUFS, "No buffer space available" },
+	{ BSM_EISCONN, EISCONN, "Socket is already connected" },
+	{ BSM_ENOTCONN, ENOTCONN, "Socket is not connected" },
+	{ BSM_ESHUTDOWN, ESHUTDOWN, "Can't send after socket shutdown" },
+	{ BSM_ETOOMANYREFS, ETOOMANYREFS, "Too many references: can't splice" },
+	{ BSM_ETIMEDOUT, ETIMEDOUT, "Operation timed out" },
+	{ BSM_ECONNREFUSED, ECONNREFUSED, "Connection refused" },
+	{ BSM_EHOSTDOWN, EHOSTDOWN, "Host is down" },
+	{ BSM_EHOSTUNREACH, EHOSTUNREACH, "No route to host" },
+	{ BSM_EALREADY, EALREADY, "Operation already in progress" },
+	{ BSM_EINPROGRESS, EINPROGRESS, "Operation now in progress" },
+	{ BSM_ESTALE, ESTALE, "Stale NFS file handle" },
+	{ BSM_EPWROFF,
+#ifdef EPWROFF
+	EPWROFF,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Device power is off" },
+	{ BSM_EDEVERR,
+#ifdef EDEVERR
+	EDEVERR,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Device error" },
+	{ BSM_EBADEXEC,
+#ifdef EBADEXEC
+	EBADEXEC,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Bad executable" },
+	{ BSM_EBADARCH,
+#ifdef EBADARCH
+	EBADARCH,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Bad CPU type in executable" },
+	{ BSM_ESHLIBVERS,
+#ifdef ESHLIBVERS
+	ESHLIBVERS,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Shared library version mismatch" },
+	{ BSM_EBADMACHO,
+#ifdef EBADMACHO
+	EBADMACHO,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Malfored Macho file" },
+	{ BSM_EPOLICY,
+#ifdef EPOLICY
+	EPOLICY,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Operation failed by policy" },
+	{ BSM_EDOTDOT,
+#ifdef EDOTDOT
+	EDOTDOT,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"RFS specific error" },
+	{ BSM_EUCLEAN,
+#ifdef EUCLEAN
+	EUCLEAN,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Structure needs cleaning" },
+	{ BSM_ENOTNAM,
+#ifdef ENOTNAM
+	ENOTNAM,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Not a XENIX named type file" },
+	{ BSM_ENAVAIL,
+#ifdef ENAVAIL
+	ENAVAIL,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"No XENIX semaphores available" },
+	{ BSM_EISNAM,
+#ifdef EISNAM
+	EISNAM,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Is a named type file" },
+	{ BSM_EREMOTEIO,
+#ifdef EREMOTEIO
+	EREMOTEIO,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Remote I/O error" },
+	{ BSM_ENOMEDIUM,
+#ifdef ENOMEDIUM
+	ENOMEDIUM,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"No medium found" },
+	{ BSM_EMEDIUMTYPE,
+#ifdef EMEDIUMTYPE
+	EMEDIUMTYPE,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Wrong medium type" },
+	{ BSM_ENOKEY,
+#ifdef ENOKEY
+	ENOKEY,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Required key not available" },
+	{ BSM_EKEYEXPIRED,
+#ifdef EKEEXPIRED
+	EKEYEXPIRED,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Key has expired" },
+	{ BSM_EKEYREVOKED,
+#ifdef EKEYREVOKED
+	EKEYREVOKED,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Key has been revoked" },
+	{ BSM_EKEYREJECTED,
+#ifdef EKEREJECTED
+	EKEYREJECTED,
+#else
+	ERRNO_NO_LOCAL_MAPPING,
+#endif
+	"Key was rejected by service" },
+};
+static const int bsm_errors_count = sizeof(bsm_errors) / sizeof(bsm_errors[0]);
+
+static const struct bsm_errors *
+au_bsm_error_lookup_errno(int error)
+{
+	int i;
+
+	if (error == ERRNO_NO_LOCAL_MAPPING)
+		return (NULL);
+	for (i = 0; i < bsm_errors_count; i++) {
+		if (bsm_errors[i].be_os_error == error)
+			return (&bsm_errors[i]);
+	}
+	return (NULL);
+}
+
+static const struct bsm_errors *
+au_bsm_error_lookup_bsm(u_char bsm_error)
+{
+	int i;
+
+	for (i = 0; i < bsm_errors_count; i++) {
+		if (bsm_errors[i].be_bsm_error == bsm_error)
+			return (&bsm_errors[i]);
+	}
+	return (NULL);
+}
+
+/*
+ * Converstion from a BSM error to a local error number may fail if either
+ * OpenBSM doesn't recognize the error on the wire, or because there is no
+ * appropriate local mapping.  However, we don't allow conversion to BSM to
+ * fail, we just convert to BSM_UKNOWNERR.
+ */
+int
+au_bsm_to_errno(u_char bsm_error, int *errorp)
+{
+	const struct bsm_errors *bsme;
+
+	bsme = au_bsm_error_lookup_bsm(bsm_error);
+	if (bsme == NULL || bsme->be_os_error == ERRNO_NO_LOCAL_MAPPING)
+		return (-1);
+	*errorp = bsme->be_os_error;
+	return (0);
+}
+
+u_char
+au_errno_to_bsm(int error)
+{
+	const struct bsm_errors *bsme;
+
+	/*
+	 * We should never be passed this libbsm-internal constant, and
+	 * because it is ambiguous we just return an error.
+	 */
+	if (error == ERRNO_NO_LOCAL_MAPPING)
+		return (BSM_UNKNOWNERR);
+	bsme = au_bsm_error_lookup_errno(error);
+	if (bsme == NULL)
+		return (BSM_UNKNOWNERR);
+	return (bsme->be_bsm_error);
+}
+
+#if !defined(KERNEL) && !defined(_KERNEL)
+const char *
+au_strerror(u_char bsm_error)
+{
+	const struct bsm_errors *bsme;
+
+	bsme = au_bsm_error_lookup_bsm(bsm_error);
+	if (bsme == NULL)
+		return ("Unrecognized BSM error");
+	if (bsme->be_os_error != ERRNO_NO_LOCAL_MAPPING)
+		return (strerror(bsme->be_os_error));
+	return (bsme->be_strerror);
+}
+#endif