From 96cabbcbb8f484f74fe69305b425b5109608e9d7 Mon Sep 17 00:00:00 2001 From: Thomas Haller Date: Wed, 22 Jun 2016 20:31:39 +0200 Subject: all: make MAC address randomization algorithm configurable For the per-connection settings "ethernet.cloned-mac-address" and "wifi.cloned-mac-address", and for the per-device setting "wifi.scan-rand-mac-address", we may generate MAC addresses using either the "random" or "stable" algorithm. Add new properties "generate-mac-address-mask" that allow to configure which bits of the MAC address will be scrambled. By default, the "random" and "stable" algorithms scamble all bits of the MAC address, including the OUI part and generate a locally- administered, unicast address. By specifying a MAC address mask, we can now configure to perserve parts of the current MAC address of the device. For example, setting "FF:FF:FF:00:00:00" will preserve the first 3 octects of the current MAC address. One can also explicitly specify a MAC address to use instead of the current MAC address. For example, "FF:FF:FF:00:00:00 68:F7:28:00:00:00" sets the OUI part of the MAC address to "68:F7:28" while scrambling the last 3 octects. Similarly, "02:00:00:00:00:00 00:00:00:00:00:00" will scamble all bits of the MAC address, except clearing the second-least significant bit. Thus, creating a burned-in address, globally administered. One can also supply a list of MAC addresses like "FF:FF:FF:00:00:00 68:F7:28:00:00:00 00:0C:29:00:00:00 ..." in which case a MAC address is choosen randomly. To fully scamble the MAC address one can configure "02:00:00:00:00:00 00:00:00:00:00:00 02:00:00:00:00:00". which also randomly creates either a locally or globally administered address. With this, the following macchanger options can be implemented: `macchanger --random` This is the default if no mask is configured. -> "" while is the same as: -> "00:00:00:00:00:00" -> "02:00:00:00:00:00 02:00:00:00:00:00" `macchanger --random --bia` -> "02:00:00:00:00:00 00:00:00:00:00:00" `macchanger --ending` This option cannot be fully implemented, because macchanger uses the current MAC address but also implies --bia. -> "FF:FF:FF:00:00:00" This would yields the same result only if the current MAC address is already a burned-in address too. Otherwise, it has not the same effect as --ending. -> "FF:FF:FF:00:00:00 " Alternatively, instead of using the current MAC address, spell the OUI part out. But again, that is not really the same as macchanger does because you explictly have to name the OUI part to use. `machanger --another` `machanger --another_any` -> "FF:FF:FF:00:00:00 ..." "$(printf "FF:FF:FF:00:00:00 %s\n" "$(sed -n 's/^\([0-9a-fA-F][0-9a-fA-F]\) \([0-9a-fA-F][0-9a-fA-F]\) \([0-9a-fA-F][0-9a-fA-F]\) .*/\1:\2:\3:00:00:00/p' /usr/share/macchanger/wireless.list | xargs)")" --- libnm-core/nm-core-internal.h | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'libnm-core/nm-core-internal.h') diff --git a/libnm-core/nm-core-internal.h b/libnm-core/nm-core-internal.h index 96624d05b8..956c910a87 100644 --- a/libnm-core/nm-core-internal.h +++ b/libnm-core/nm-core-internal.h @@ -283,6 +283,16 @@ void _nm_setting_vlan_get_priorities (NMSettingVlan *setting, /***********************************************************/ +struct ether_addr; + +gboolean _nm_utils_generate_mac_address_mask_parse (const char *value, + struct ether_addr *out_mask, + struct ether_addr **out_ouis, + gsize *out_ouis_len, + GError **error); + +/***********************************************************/ + typedef enum { NM_BOND_OPTION_TYPE_INT, NM_BOND_OPTION_TYPE_STRING, -- cgit v1.2.1