Re: Linking a cookie to an IP address is a very bad in 2015...
"Walter H." <Walter.H@mathemainzel.info> Sat, 04 April 2015 16:55 UTC
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Date: Sat, 04 Apr 2015 18:51:31 +0200
From: "Walter H." <Walter.H@mathemainzel.info>
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To: Jim Manico <jim@manico.net>
CC: Max Bruce <max.bruce12@gmail.com>, "ietf-http-wg@w3.org" <ietf-http-wg@w3.org>
References: <D141A3E5.4146E%evyncke@cisco.com> <20150401114608.GA7832@1wt.eu> <04DD393C-711F-4C9E-B21C-B184B8972DFC@apple.com> <20150401150716.GA7871@1wt.eu> <25C792A9-56D0-452D-A46C-561A44E4F229@manico.net> <20150401151634.GB7871@1wt.eu> <CABb0SYQ5=5BHSH-JQ5XsCi_bQ8h5FN=WNPvAYkzy94Bm=yTVwg@mail.gmail.com> <551E3D00.5090501@mathemainzel.info> <CABb0SYQAOXRWL5TvD5H5g_4VDwLxF=6kzhmVgCSK8Pv7pq8Apw@mail.gmail.com> <551FB3A5.503@mathemainzel.info> <CABb0SYRUvtTdZQGZkvNVTaA_yW79Q6Pd0Uh8exjE8zErzQNbsA@mail.gmail.com> <4B01B6DC-9EE3-4501-8CE1-CEBA3F19D9D3@manico.net>
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Subject: Re: Linking a cookie to an IP address is a very bad in 2015...
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user-agent: the change of user-agent should be noticeable after its restart; when it changes without a restart you have a serious security problem, e.g. some badware is setting "general.agent.override" in Firefox; IP-address: with mobile devices you have to distinguish something; as long as your device only changes the location in small distances, so that it stays inside the same mobile network operator, the IP-address remains the same, because this is handled some layer below; when the mobile network operator or just the ISP cuts the connection after a specified time, e.g. every 8 hours, then this would be the same as a reboot of a normal computer and there it is not a good idea to be able to go further inside the session, that was active before shutting down the computer ... (think of an electronic banking session, which is a little bit more sensitive than just looking around anywhere e.g. youtube) think of what can happen, so that you bring the "login-page" instead of going further in the session; I'd bring the login-page when one of the following changes: source-ip:source-port user-agent but not, when you notice a change of the following: screen resolution client-time, except there is a defined timeout of e.g. 15 minutes On 04.04.2015 18:12, Jim Manico wrote: > In the world of auto-updating browsers and therefor auto-updating > user-agents, tying authentication to a user agent could have > unintended negative consequences. > > Tying authN to an IP address also has negative unintended > consequences, like being on a mobile network while traveling, or being > behind certain gateways - your IP address may change in short timespans. > > On Apr 4, 2015, at 3:18 AM, Max Bruce <max.bruce12@gmail.com > <mailto:max.bruce12@gmail.com>> wrote: > >> The session ID is a cookie, so in the headers. And yes, because it >> also checks that cookie, which is randomly generated. It just >> enforces a user-agent server-side. It DID enforce an IP, but I >> removed this for other reasons discussed earlier. >> >> On Sat, Apr 4, 2015 at 2:49 AM, Walter H. <Walter.H@mathemainzel.info >> <mailto:Walter.H@mathemainzel.info>> wrote: >> >> let me ask it different: where is the Session ID, is it part of >> a http-header, part of a html-header, a session-cookie, or is it >> part of the URL itself that is requested? >> >> the second: two ident configured hosts behind NAT do not differ >> neither in the user agent nor in the IP address; they only differ >> in the source TCP-port ... >> >> On 03.04.2015 09:13, Max Bruce wrote: >>> When you say transmitting from host to server, what do you mean? >>> And yes, if I understand what your asking. It effectively >>> compiled a random hash, and then enforced an IP & user agent. I >>> have recently removed the IP enforecement though. >>> >>> On Fri, Apr 3, 2015 at 12:10 AM, Walter H. >>> <Walter.H@mathemainzel.info <mailto:Walter.H@mathemainzel.info>> >>> wrote: >>> >>> On 01.04.2015 21:48, Max Bruce wrote: >>>> What about linking to several? I wrote a session system for >>>> my Web Server that will only allow access to the original >>>> Session ID if the IP & User-Agent has remained unchanged, >>>> in order to protect against session hijacking. I've found >>>> it's highly effective, unless you IP Spoof. >>> what kind of mechanism do you use for transmitting the >>> Session ID from host to server? >>> does it prevent access from an ident configured but >>> different host behind a NAT? >>>
- Linking a cookie to an IP address is a very bad i… Eric Vyncke (evyncke)
- Re: Linking a cookie to an IP address is a very b… Willy Tarreau
- Re: Linking a cookie to an IP address is a very b… Willy Tarreau
- Re: Linking a cookie to an IP address is a very b… Eric Vyncke (evyncke)
- Re: Linking a cookie to an IP address is a very b… Michael Sweet
- Re: Linking a cookie to an IP address is a very b… Willy Tarreau
- Re: Linking a cookie to an IP address is a very b… Jim Manico
- Re: Linking a cookie to an IP address is a very b… Willy Tarreau
- Re: Linking a cookie to an IP address is a very b… Max Bruce
- Re: Linking a cookie to an IP address is a very b… Willy Tarreau
- Re: Linking a cookie to an IP address is a very b… Max Bruce
- Re: Linking a cookie to an IP address is a very b… Willy Tarreau
- Re: Linking a cookie to an IP address is a very b… Michael Sweet
- Re: Linking a cookie to an IP address is a very b… Michael Sweet
- Re: Linking a cookie to an IP address is a very b… Jim Manico
- Re: Linking a cookie to an IP address is a very b… Eric Vyncke (evyncke)
- Re: Linking a cookie to an IP address is a very b… Eric Vyncke (evyncke)
- Re: Linking a cookie to an IP address is a very b… Michael Sweet
- Re: Linking a cookie to an IP address is a very b… Zhong Yu
- Re: Linking a cookie to an IP address is a very b… Martin Thomson
- Re: Linking a cookie to an IP address is a very b… Zhong Yu
- Re: Linking a cookie to an IP address is a very b… Zhong Yu
- Re: Linking a cookie to an IP address is a very b… Martin Thomson
- Re: Linking a cookie to an IP address is a very b… Zhong Yu
- Re: Linking a cookie to an IP address is a very b… Michael Sweet
- Re: Linking a cookie to an IP address is a very b… Jim Manico
- Re: Linking a cookie to an IP address is a very b… Jim Manico
- Re: Linking a cookie to an IP address is a very b… Walter H.
- Re: Linking a cookie to an IP address is a very b… Willy Tarreau
- Re: Linking a cookie to an IP address is a very b… Walter H.
- Re: Linking a cookie to an IP address is a very b… Willy Tarreau
- Re: Linking a cookie to an IP address is a very b… Walter H.
- Re: Linking a cookie to an IP address is a very b… Max Bruce
- Re: Linking a cookie to an IP address is a very b… Walter H.
- Re: Linking a cookie to an IP address is a very b… Max Bruce
- Re: Linking a cookie to an IP address is a very b… Eric Vyncke (evyncke)
- Re: Linking a cookie to an IP address is a very b… Jim Manico
- Re: Linking a cookie to an IP address is a very b… Walter H.
- Re: Linking a cookie to an IP address is a very b… Walter H.
- Re: Linking a cookie to an IP address is a very b… Jim Manico
- Re: Linking a cookie to an IP address is a very b… Max Bruce
- Re: Linking a cookie to an IP address is a very b… Max Bruce
- Re: Linking a cookie to an IP address is a very b… Jim Manico
- Re: Linking a cookie to an IP address is a very b… Eric Vyncke (evyncke)
- Re: Linking a cookie to an IP address is a very b… Walter H.