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plugin: Export secure_memzero() to plug-ins

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The provides plug-ins with a safe and secure way to santize sensitive
information such as passwords, by re-using the secure_memzero()
implementation in OpenVPN.

Signed-off-by: David Sommerseth <davids@openvpn.net>
Acked-by: Selva Nair <selva.nair@gmail.com>
Message-Id: <20170505184622.24520-1-davids@openvpn.net>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg14546.html
Signed-off-by: David Sommerseth <davids@openvpn.net>
This commit is contained in:
David Sommerseth 2017-05-05 20:46:22 +02:00
parent 9900e023bc
commit f018dfcc36
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GPG Key ID: 86CF944C9671FDF2
2 changed files with 24 additions and 4 deletions
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25
include/openvpn-plugin.h.in
View File

@ -199,7 +199,8 @@ struct openvpn_plugin_string_list
/* openvpn_plugin_{open,func}_v3() related structs */
/* Defines version of the v3 plugin argument structs
/**
* Defines version of the v3 plugin argument structs
*
* Whenever one or more of these structs are modified, this constant
* must be updated. A changelog should be appended in this comment
@ -218,8 +219,10 @@ struct openvpn_plugin_string_list
* 3 Added ovpn_version, ovpn_version_major, ovpn_version_minor
* and ovpn_version_patch to provide the runtime version of
* OpenVPN to plug-ins.
*
* 4 Exported secure_memzero() as plugin_secure_memzero()
*/
#define OPENVPN_PLUGINv3_STRUCTVER 3
#define OPENVPN_PLUGINv3_STRUCTVER 4
/**
* Definitions needed for the plug-in callback functions.
@ -255,9 +258,18 @@ typedef void (*plugin_vlog_t)(openvpn_plugin_log_flags_t flags,
const char *plugin_name,
const char *format,
va_list arglist) _ovpn_chk_fmt (3, 0);
#undef _ovpn_chk_fmt
/**
* Export of secure_memzero() to be used inside plug-ins
*
* @param data Pointer to data to zeroise
* @param len Length of data, in bytes
*
*/
typedef void (*plugin_secure_memzero_t)(void *data, size_t len);
/**
* Used by the openvpn_plugin_open_v3() function to pass callback
* function pointers to the plug-in.
@ -267,11 +279,18 @@ typedef void (*plugin_vlog_t)(openvpn_plugin_log_flags_t flags,
* Messages will only be displayed if the plugin_name parameter
* is set. PLOG_DEBUG messages will only be displayed with plug-in
* debug log verbosity (at the time of writing that's verb >= 7).
*
* plugin_secure_memzero
* : Use this function to securely wipe sensitive information from
* memory. This function is declared in a way that the compiler
* will not remove these function calls during the compiler
* optimization phase.
*/
struct openvpn_plugin_callbacks
{
plugin_log_t plugin_log;
plugin_vlog_t plugin_vlog;
plugin_secure_memzero_t plugin_secure_memzero;
};
/**

3
src/openvpn/plugin.c
View File

@ -410,7 +410,8 @@ plugin_log(openvpn_plugin_log_flags_t flags, const char *name, const char *forma
static struct openvpn_plugin_callbacks callbacks = {
plugin_log,
plugin_vlog
plugin_vlog,
secure_memzero /* plugin_secure_memzero */
};