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An Overhaul of LJ-Stat

I’m currently working on an overhaul of LJ-Stat.

It looks like there’s some issue in using curl_multi_exec() in PHP with too many requests at once causing some requests to fail strangely, potentially accounting for the lack of data from several sites that are clearly not down and clearly provide stats.txt.  My current workaround is to do the requests in smaller blocks.

I’m also trying to provide more detail as to why there aren’t stats for the sites that don’t have stats.

But the biggest development is that there will probably be graphs of the data over time.  I say “probably” because while the code is pretty much written, I’ve only been storing historical data for about a day so far (in the past, only the most recent data was kept), so it’s hard to tell whether the graphs will look okay with a lot of data and whether producing the graphs will put a significant load on the server.  The data will probably update more regularly and more frequently–likely noon and midnight CT.

Also, if anyone knows for sure if Bloty, IziBlog, and/or LiveLogCity are still alive or definitively dead, I’d like to know.  Oh, and CommieJournal seems to be looking at the posibility of moving to a different codebase, though I can’t for the life of me see why anyone would want to try to move thousands of accounts from the LJ codebase to something incompatible and with a different working paradigm.

Posted 12 October 2008 † 2718.us § LJ-Stat ‡ Comments (0) ° Tagged: , , , , , , , , , , , , , , ,

A Variety of Issues with Pseudo-Random Numbers in PHP

It appears that there are now demonstrated exploits of PHP apps that use mt_rand() and/or rand() as a result of issues of seeding in one application affecting the PRNG stream in another application that used the PRNG to generate passwords or similar such things.  From mt_srand and not so random numbers:

… it is strongly recommended for the PHP developers to add more secure random number functions to the PHP core and it is strongly recommended for PHP application developers to keep their fingers away from srand() or mt_srand() and to never ever use rand() or mt_rand() for cryptographic secrets.

It sounds like the PRNGs in PHP, mt_rand() and rand(), shouldn’t be used for anything security-related, and perhaps /dev/random or /dev/srandom or some such should be used instead (though this is much more system-dependent).

Posted 31 August 2008 † 2718.us § Web Programming ‡ Comments (0) ° Tagged: , , , , , , , , , , , , , , ,

The Ups and Downs of Cheap VPSs

I’d written before about a really good VPS deal and how I was using it for additional secondary DNS.  Not entirely surprisingly, that provider seems to have entirely vanished shortly after sending me an email at the end of my 1-month account asking me to renew (hard to renew when their web site doesn’t exist anymore).  This has sent me looking for another deal, since I still think the premise is good.  The two providers I landed on are PTXL and Budget VPS Hosting/Web Wide Hosting.  While both seem decent on the face of it and while I don’t yet have enough experience with either to give a proper review, I can safely say that I’m becoming even more appreciative of RapidVPS, with whom I have my primary VPSs that do all my substantive serving.

My experience thusfar with PTXL is that while they sent me login info almost immediately upon registration yesterday, they didn’t actually activate that info until about 20 hours later, so I couldn’t even *buy* the thing until today.  Now, I go to buy it and find that I have to add the money to my account, then use it to buy and that I can only add money through PayPal and that they charge a fee to add money through PayPal.  This makes their advertised price deceptive, though their quarterly pricing, even with the PayPal fees, is still quite reasonable.  Once I navigated the payment mechanics, the VPS turnup was almost instant.

My experience with Budget VPS/Web Wide is a bit different.  While the Web Wide site refers you to the Budget VPS site, the Budget VPS site kicks you back to Web Wide to actually transact business.  Strange.  Account creation was essentially instant, payment via PayPal was simple (no extra fees), and almost immediately yesterday, a VPS appeared in my account panel with status “pending.”  After a few minutes of this, I went digging through their knowledge base and it was suggested that while turnup is generally quick, it may take up to 24 hours or longer and that if it’d be over 24 hours, they’d email.  I was not thrilled with this, but I’d already paid and I’m not in all that much of a rush.  I came home tonight, about 30 hours after creation, to find it still “pending” and no email from them, so I’ve filed a support ticket.

Just for comparison, RapidVPS charges what they say they charge, no extra fees, deals directly with payment, no PayPal, and account creation and turnup are both really instant, no messing around.  I’ve also been using them for a while and they don’t seem to be vanishing into the mist anytime soon.  Oh, and when I was just starting out and had a few total n00b questions, they were really nice and helpful (at no extra charge!).

Posted 31 August 2008 † 2718.us § General § Networking ‡ Comments (2) ° Tagged: , , , , , ,

More Hackery with Slug Asterisk

I wanted to make my slug running Asterisk do wakeup calls, since I currently pay $11/month for a daily wakeup call service and they’ll only try up to 4 times.  As my starting point, I was using this dialplan from the-asterisk-book.com:

  1. [hotel-intern]
  2. exten => _*77*XXXXXXXXXXXX,1,Answer()
  3. exten => _*77*XXXXXXXXXXXX,n,Set(year=${EXTEN:4:4})
  4. exten => _*77*XXXXXXXXXXXX,n,Set(month=${EXTEN:8:2})
  5. exten => _*77*XXXXXXXXXXXX,n,Set(day=${EXTEN:10:2})
  6. exten => _*77*XXXXXXXXXXXX,n,Set(hours=${EXTEN:12:2})
  7. exten => _*77*XXXXXXXXXXXX,n,Set(minutes=${EXTEN:14:2})
  8. exten => _*77*XXXXXXXXXXXX,n,NoOp(Wake-up call scheduled for ${CALLERID(num)} at ${hours}:${minutes} on ${day}.${month}.${year}.)
  9. exten => _*77*XXXXXXXXXXXX,n,System(echo -e "Channel: SIP/${CALLERID(num)}\\nContext: wake-up\\nExtension: 23" > /tmp/${UNIQUEID}.call)
  10. exten => _*77*XXXXXXXXXXXX,n,System(touch -t ${year}${month}${day}${hours}${minutes} /tmp/${UNIQUEID}.call)
  11. exten => _*77*XXXXXXXXXXXX,n,System(mv /tmp/${UNIQUEID}.call /var/spool/asterisk/outgoing/)
  12. exten => _*77*XXXXXXXXXXXX,n,Playback(rqsted-wakeup-for)
  13. exten => _*77*XXXXXXXXXXXX,n,SayNumber(${hours})
  14. exten => _*77*XXXXXXXXXXXX,n,SayNumber(${minutes})
  15. exten => _*77*XXXXXXXXXXXX,n,Hangup()
  16.  
  17. [wake-up]
  18. exten => 23,1,Answer()
  19. exten => 23,n,Wait(1)
  20. exten => 23,n,Playback(this-is-yr-wakeup-call)
  21. exten => 23,n,Wait(1)
  22. exten => 23,n,Hangup()

The problem is that my slug is unslung, running busybox for most basic *nix tools and busybox’s touch command doesn’t support the -t option, so I can’t set the modification time on the file to properly queue it.  My half-assed workaround is a shell script (because I couldn’t get the System() command to run the whole string, try as I might) that nohups a background shell process that sleeps for the difference in seconds between now and the wakeup time, then creates the call file.  Not great for far-future scheduling or for large numbers of calls and it won’t survive a reboot, but it’s a start.

#!/bin/sh
  1.  
  2. nohup sh -c "sleep $((`/bin/date –date="$1" +"%s"` – `/bin/date +"%s"`)) ; echo -e 'Channel: $2\\nContext: wake-up\\nExtension: 23' > /tmp/$3.call ; mv /tmp/$3.call /opt/var/spool/asterisk/outgoing/" >/dev/null &

My Asterisk diaplan macro passes the target time/date string as the first argument, the target channel as the second, and the ${UNIQUEID} as the third.  One further wrinkle:  busybox 1.3.1, which was what came with the unslung firmware I used, doesn’t have nohup, so it won’t work; busybox 1.10.3 is what ipkg installed into /opt/ and has nohup, but the date command in 1.10.3 didn’t seem to support –date (at all, or maybe just not properly), so nohup is a reference to the 1.10.3 busybox in /opt/bin while /bin/date is a reference to the original 1.3.1 busybox.  Stupid, but it works.

(Oh, and as I told the last person I saw wearing a t-shirt that said “If it’s stupid, but it works, then it isn’t stupid,” there’s definitely such a thing as works-but-stupid–this script hackery is such a thing.  The better solution, space permitting, is probably just to install the coreutils package so as to have proper non-busybox touch and date)

Posted 18 August 2008 † 2718.us § Telephony ‡ Comments (0) ° Tagged: , , , , , , , , , , , , , , , , , ,

WordPress 2.6 + bbPress 0.9.0.2

In case anyone was still curious following my previous headache post, it is possible to integrate WP2.6 and bbPress 0.9.0.2.  I say “possible” because while I’ve got it working as far as I can tell (without having modified core code in either WP or bbP), I haven’t really tested it and it’s a mess.  More or less, a specially-crafted plugin for WP plus a specially-crafted plugin for bbP got me nearly there.  The one hangup was the login cookie (the new one that is at the root of the site), which while my bbPress plugin seemed to be duplicating it, WP didn’t want to recognize it (I couldn’t find any difference between the cookie set by my bbP plugin and the one set by WP, but WP didn’t like mine anyway).  I got around this by bypassing the bbP login mechanism entirely and using the WP login with a redirect back to bbPress.

Of course, it’s also annoying that while there’s a set_auth_cookie action hook, there’s no clear_auth_cookie, so my plugins had to override the clear_auth_cookie function wholesale rather than hooking into it as they do with set_auth_cookie.

If you have some twisted desire to make this unholy integration that I now seem to have working and would like some of my code, leave me a comment.

Posted 16 August 2008 † 2718.us § Web Programming ‡ Comments (3) ° Tagged: , , , , , , , , , , , , , ,

OS X, Wake-on-LAN, and Passworded Screensavers

The other day, I realized while I was at work that I needed some files from my Mac desktop at home.  Normally, no problem, ssh into my firewall and open a tunnel to my desktop (this is better done with authpf, but that’s a post for another time), use sftp, and done.  The problem is that because of unexplained kernel panics (probably a bad RAM module), my desktop would crash hard if left on all day, so I’ve been putting it to sleep when I go to work.  Now, with my Mac set to wake for remote admin access, I ought to be able to run a wake-on-LAN utility to wake it up and be fine, except that I use a passworded screensaver.  With a passworded screensaver, waking the machine locally or remotely will give 30-60-second window during which the computer is awake and expecting a password to be entered at the physical machine; there doesn’t seem to be a way to do this remotely and unlike earlier versions of OS X, since 10.3 or 10.4 or so, you can’t just kill the screensaver process from the command line (i.e. by logging in with ssh).

On the other hand, ssh is a very robust protocol and somehow ssh sessions seem to readily survive disconnect/reconnect cycles. Making use of this, it is possible to get a workable, if slow, connection to a passworded-and-sleeping Mac.  On one connection to the firewall machine, run a loop of the wake-on-LAN command so that the magic packets that make the Mac wake are being sent every second or so.  Use another connection to ssh into the Mac and do whatever you need to do.  It helps to plan out what you need to do so that you can get the commands in fast, but even during the cycle where the Mac goes back to sleep and gets reawakened by the wake-on-LAN loop, you can type commands; they just won’t appear (not even echoed) until ssh recovers the connection.

While this is an annoying way to use a machine and it’s probably not good for the hardware to cycle in and out of sleep repeatedly in such a short time span, it does give a way to get at a passworded and sleeping Mac remotely.

Posted 13 August 2008 † 2718.us § Networking ‡ Comments (0) ° Tagged: , , , , , , , , , , ,

WordPress 2.6 is Giving Me a Headache

Now, I’m really big on *not* complaining about new versions of things and I especially dislike the practice of complaining about how a new version of WordPress broke some plugin that is of dire importance to someone’s website, but WordPress 2.6 is starting to give me a headache.  I’ve already posted thrice about issues with integrating an external site into WP2.6′s user authentication.  Honestly, I consider that to be my own problem to solve and not WP’s fault, since I’m hooking into WP in a way that wasn’t intended, so I have no right to expect them to preserve my ability to (mis)use it.

However, I just came across this in the bbPress forums:

As of July 2008, do NOT try to integrate WordPress 2.6 with bbPress 0.9 Use WP 2.5.1 – the reason for this is simple – WordPress has radically changed the way cookies are used. If you have already installed WP 2.6, don’t worry you have not broken anything, you’ll just need to downgrade and install 2.5 instead. 2.5.1 is perfectly stable and has no known security issues – 2.6 only adds a few new features to WP. There is an updated version of bbPress in the works to support the new cookie method but it might be awhile before it’s available in a mainstream release.

Now, ostensibly, WP and bbPress are coming from the same people/place/company/organization/whatever, so I think I should be able to expect the one to work with the other and to *not* have the left hand tell me to ignore what the right hand is doing.  This is almost enough (*almost*) to make me give up on trying to piece together a decent way to hook into the is_user_logged_in() thing for the non-WP part of the WP-based site I’m working on, since the bbPress part of the site won’t work even if I do fix the non-WP part of the site.

Posted 03 August 2008 † 2718.us § Web Programming ‡ Comments (1) ° Tagged: , , , , , , , ,

Authenticating with WordPress 2.6 (part 3)

So, as a followup to parts 1 and 2, per WordPress Trac ticket #7001, WordPress 2.6 has split up the login cookies into three parts:

  • what was the one and only login cookie in 2.5 is now limited to /wp-admin
  • there’s a copy of that one that’s just limited to /wp-content/plugins, for backward compatibility with plugins
  • there’s a new cookie that is at COOKIEPATH (which can be defined in your config file), that is checked by calling 
    is_user_logged_in()

    (but perhaps this isn’t intended for secure authorization?)

So, it appears the way to go may be to change 

auth_redirect()

to

  1. if (!is_user_logged_in()) auth_redirect();

Maybe more to follow on this when I’ve more thoroughly explored it.

Posted 03 August 2008 † 2718.us § Web Programming ‡ Comments (8) ° Tagged: , , , , , , , , , , , , , , , , , , , , , , , ,

A List Apart Survey

A List Apart is probably one of my favorite sites about web design.  Their 2008 survey of web professionals is running now.

Posted 30 July 2008 † 2718.us § Web Programming ‡ Comments (1) ° Tagged: , , ,

Authenticating with WordPress 2.6 (part 2)

Having stated the problem and now played further, I’ve got good news and bad news.

The good news is that there’s an action hook, ‘set_auth_cookie’, that gets called whenever the cookies are set, so if the stuff for which you want to authenticate is on the same server but at a different path, you can create a plugin (or maybe use functions.php in your theme?) with something like the following:

  1. function your_unique_name_here_set_auth_cookie($auth_cookie, $expire, $expiration, $user_id, $scheme) {
  2.     setcookie(AUTH_COOKIE, $auth_cookie, $expire, '/path/to/your/stuff', COOKIE_DOMAIN);
  3. }
  4.  
  5. add_action('set_auth_cookie','your_unique_name_here_set_auth_cookie',10,5);

The bad news is that if your WordPress install is at example.com/something and you want to use it to authenticate at portal.example.com, you can’t set a cookie for portal.example.com from a script on example.com, so your only choice would be to set a cookie with path / on .example.com (note the leading period), which completely breaks the security added by the separate cookies.

Hopefully, there’ll be a “part 3″ to this wherein I solve this last problem somehow, since that’s the setup I’m dealing with.

Posted 29 July 2008 † 2718.us § Web Programming ‡ Comments (1) ° Tagged: , , , , , , , , , , , , , , , , , , , , , ,
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