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[syslog] Strip invalid characters from hostname

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Avoid generating syntactically invalid log messages by ensuring that
invalid characters are not present in the hostname.  In particular,
ensure that any whitespace is stripped, since whitespace functions as
a field separator for syslog messages.

Reported-by: Alex Davies <adavies@jumptrading.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2014-05-16 13:45:52 +01:00
parent 4e4fc678c2
commit e5878ce65d
1 changed files with 31 additions and 6 deletions
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37
src/net/udp/syslog.c
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@ -27,6 +27,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
#include <stdint.h>
#include <stdlib.h>
#include <ctype.h>
#include <byteswap.h>
#include <ipxe/xfer.h>
#include <ipxe/open.h>
@ -91,15 +92,15 @@ static char *syslog_domain;
*/
int syslog_send ( struct interface *xfer, unsigned int severity,
const char *message, const char *terminator ) {
const char *hostname = ( syslog_hostname ? syslog_hostname : "" );
const char *domain = ( ( hostname[0] && syslog_domain ) ?
syslog_domain : "" );
return xfer_printf ( xfer, "<%d>%s%s%s%sipxe: %s%s",
SYSLOG_PRIORITY ( SYSLOG_DEFAULT_FACILITY,
severity ),
( syslog_hostname ? syslog_hostname : "" ),
( syslog_domain ? "." : "" ),
( syslog_domain ? syslog_domain : "" ),
( ( syslog_hostname || syslog_domain ) ? " " : ""),
message, terminator );
severity ), hostname,
( domain[0] ? "." : "" ), domain,
( hostname[0] ? " " : "" ), message, terminator );
}
/******************************************************************************
@ -211,6 +212,28 @@ const struct setting syslog6_setting __setting ( SETTING_MISC, syslog6 ) = {
.scope = &ipv6_scope,
};
/**
* Strip invalid characters from host/domain name
*
* @v name Name to strip
*/
static void syslog_fix_name ( char *name ) {
char *fixed = name;
int c;
/* Do nothing if name does not exist */
if ( ! name )
return;
/* Strip any non-printable or whitespace characters from the name */
do {
c = *(name++);
*fixed = c;
if ( isprint ( c ) && ! isspace ( c ) )
fixed++;
} while ( c );
}
/**
* Apply syslog settings
*
@ -223,8 +246,10 @@ static int apply_syslog_settings ( void ) {
/* Fetch hostname and domain name */
free ( syslog_hostname );
fetch_string_setting_copy ( NULL, &hostname_setting, &syslog_hostname );
syslog_fix_name ( syslog_hostname );
free ( syslog_domain );
fetch_string_setting_copy ( NULL, &domain_setting, &syslog_domain );
syslog_fix_name ( syslog_domain );
/* Fetch log server */
syslog_console.disabled = CONSOLE_DISABLED;