git.rot13.org Git - goodfet/blob - client/GoodFETGlitch.py

   1 #!/usr/bin/env python
   2 # GoodFET Client Library
   3 #
   4 # (C) 2009 Travis Goodspeed <travis at radiantmachines.com>
   5 #
   6 # This code is being rewritten and refactored.  You've been warned!
   7
   8 import sys, time, string, cStringIO, struct, glob, serial, os, random;
   9 import sqlite3;
  10
  11 from GoodFET import *;
  12
  13
  14 # After four million points, this kills 32-bit gnuplot.
  15 # Dumping to a bitmap might be preferable.
  16 script_timevcc="""
  17 plot "< sqlite3 glitch.db 'select time,vcc,glitchcount from glitches where count=0;'" \
  18 with dots \
  19 title "Scanned", \
  20 "< sqlite3 glitch.db 'select time,vcc,count from glitches where count>0;'" \
  21 with dots \
  22 title "Success", \
  23 "< sqlite3 glitch.db 'select time,vcc,count from glitches where count>0 and lock>0;'" \
  24 with dots \
  25 title "Exploited"
  26 """;
  27 script_timevccrange="""
  28 plot "< sqlite3 glitch.db 'select time,vcc,glitchcount from glitches where count=0;'" \
  29 with dots \
  30 title "Scanned", \
  31 "< sqlite3 glitch.db 'select time,vcc,count from glitches where count>0;'" \
  32 with dots \
  33 title "Success", \
  34 "< sqlite3 glitch.db 'select time,max(vcc),count from glitches where count=0 group by time ;'" with lines title "Max", \
  35 "< sqlite3 glitch.db 'select time,min(vcc),count from glitches where count>0 group by time ;'" with lines title "Min"
  36 """;
  37
  38 class GoodFETGlitch(GoodFET):
  39
  40     def __init__(self, *args, **kargs):
  41         print "Initializing GoodFET Glitcher."
  42         #Database connection w/ 30 second timeout.
  43         self.db=sqlite3.connect("glitch.db",30000);
  44
  45         #Training
  46         self.db.execute("create table if not exists glitches(time,vcc,gnd,trials,glitchcount,count,lock);");
  47         self.db.execute("create index if not exists glitchvcc on glitches(vcc);");
  48         self.db.execute("create index if not exists glitchtime on glitches(time);");
  49
  50         #Exploitation record, to be built from the training table.
  51         self.db.execute("create table if not exists exploits(time,vcc,gnd,trials,count);");
  52         self.db.execute("create index if not exists exploitvcc on exploits(vcc);");
  53         self.db.execute("create index if not exists exploittime on exploits(time);");
  54
  55         self.client=0;
  56     def setup(self,arch="avr"):
  57         self.client=getClient(arch);
  58         self.client.serInit();
  59
  60     def glitchvoltages(self,time):
  61         """Returns list of voltages to train at."""
  62         c=self.db.cursor();
  63         #c.execute("""select
  64         #             (select min(vcc) from glitches where time=? and count=1),
  65         #             (select max(vcc) from glitches where time=? and count=0);""",
  66         #          [time, time]);
  67         c.execute("select min,max from glitchrange where time=? and max-min>0;",[time]);
  68         rows=c.fetchall();
  69         for r in rows:
  70             min=r[0];
  71             max=r[1];
  72             if(min==None or max==None): return [];
  73
  74             spread=max-min;
  75             return range(min,max,1);
  76         #If we get here, there are no points.  Return empty set.
  77         return [];
  78     def crunch(self):
  79         """This builds tables for glitching voltage ranges from the training set."""
  80         print "Precomputing glitching ranges.  This might take a long while.";
  81         print "Times...";
  82         sys.stdout.flush();
  83         self.db.execute("drop table if exists glitchrange;");
  84         self.db.execute("create table glitchrange(time integer primary key asc,max,min);");
  85         self.db.commit();
  86         print "Calculating ranges...";
  87         sys.stdout.flush();
  88
  89         maxes={};
  90         mins={};
  91
  92         c=self.db.cursor();
  93         c.execute("select time,vcc,count from glitches;"); #Limit 10000 for testing.
  94         progress=0;
  95         for r in c:
  96             progress=progress+1;
  97             if progress % 1000000==0: print "%09i rows crunched." % progress;
  98             t=r[0];
  99             v=r[1];
 100             count=r[2];
 101             if count==0:
 102                 try: oldmax=maxes[t];
 103                 except: oldmax=-1;
 104                 if v>oldmax: maxes[t]=v;
 105             elif count==1:
 106                 try: oldmin=mins[t];
 107                 except: oldmin=0x10000;
 108                 if v<oldmin: mins[t]=v;
 109         print "List complete.  Inserting.";
 110         for t in maxes:
 111             max=maxes[t];
 112             try: min=mins[t];
 113             except: min=0;
 114             self.db.execute("insert into glitchrange(time,max,min) values (?,?,?)",(t,max,min));
 115         self.db.commit();
 116         print "Done, database crunched.";
 117     def graphx11(self):
 118         try:
 119             import Gnuplot, Gnuplot.PlotItems, Gnuplot.funcutils
 120         except ImportError:
 121             print "gnuplot-py is missing.  Can't graph."
 122             return;
 123         g = Gnuplot.Gnuplot(debug=1);
 124         g.clear();
 125
 126         g.title('Glitch Training Set');
 127         g.xlabel('Time (16MHz)');
 128         g.ylabel('VCC (DAC12)');
 129
 130         g('set datafile separator "|"');
 131
 132         g(script_timevcc);
 133         print "^C to exit.";
 134         while 1==1:
 135             time.sleep(30);
 136     def graph(self):
 137         import Gnuplot, Gnuplot.PlotItems, Gnuplot.funcutils
 138         g = Gnuplot.Gnuplot(debug=1);
 139
 140         g('\nset term png');
 141         g.title('Glitch Training Set');
 142         g.xlabel('Time (16MHz)');
 143         g.ylabel('VCC (DAC12)');
 144
 145         g('set datafile separator "|"');
 146         g('set term png');
 147         g('set output "timevcc.png"');
 148         g(script_timevcc);
 149
 150     #GnuPlot sucks for large sets.  Switch to viewpoints soon.
 151     # sqlite3 glitch.db "select time,vcc,count from glitches where count=0" | vp -l -d "|" -I
 152
 153     def explore(self,tstart=0,tstop=-1, trials=1):
 154         """Exploration phase.  Uses thresholds to find exploitable points."""
 155         gnd=0;
 156         self.scansetup(1); #Lock the chip, place key in eeprom.
 157         if tstop<0:
 158             tstop=self.client.glitchstarttime();
 159         times=range(tstart,tstop);
 160         random.shuffle(times);
 161         #self.crunch();
 162         count=0.0;
 163         total=1.0*len(times);
 164
 165         c=self.db.cursor();
 166         c.execute("select time,min,max from glitchrange where max-min>0;");
 167         rows=c.fetchall();
 168         c.close();
 169         random.shuffle(rows);
 170         for r in rows:
 171             t=r[0];
 172             min=r[1];
 173             max=r[2];
 174             voltages=range(min,max,1);
 175             count=count+1.0;
 176             print "%02.02f Exploring %04i points in t=%04i." % (count/total,len(voltages),t);
 177             sys.stdout.flush();
 178             for vcc in voltages:
 179                 self.scanat(1,trials,vcc,gnd,t);
 180     def learn(self):
 181         """Learning phase.  Finds thresholds at which the chip screws up."""
 182         trials=1;
 183         lock=0;  #1 locks, 0 unlocked
 184         vstart=0;
 185         vstop=1024;  #Could be as high as 0xFFF, but upper range is useless
 186         vstep=1;
 187         tstart=0;
 188         tstop=self.client.glitchstarttime();
 189         tstep=0x1; #Must be 1
 190         self.scan(lock,trials,range(vstart,vstop),range(tstart,tstop));
 191         print "Learning phase complete, beginning to expore.";
 192         self.explore();
 193
 194     def scansetup(self,lock):
 195         client=self.client;
 196         client.start();
 197         client.erase();
 198
 199         self.secret=0x69;
 200
 201         while(client.eeprompeek(0)!=self.secret):
 202             print "-- Setting secret";
 203             client.start();
 204
 205             #Flash the secret to the first two bytes of CODE memory.
 206             client.erase();
 207             client.eeprompoke(0,self.secret);
 208             client.eeprompoke(1,self.secret);
 209             sys.stdout.flush()
 210
 211         #Lock chip to unlock it later.
 212         if lock>0:
 213             client.lock();
 214
 215
 216     def scan(self,lock,trials,voltages,times):
 217         """Scan many voltages and times."""
 218         client=self.client;
 219         self.scansetup(lock);
 220         gnd=0;
 221         random.shuffle(voltages);
 222         #random.shuffle(times);
 223
 224         for vcc in voltages:
 225             if lock<0 and not self.vccexplored(vcc):
 226                 print "Exploring vcc=%i" % vcc;
 227                 sys.stdout.flush();
 228                 for time in times:
 229                     self.scanat(lock,trials,vcc,gnd,time)
 230                     sys.stdout.flush()
 231                 self.db.commit();
 232             else:
 233                 print "Voltage %i already explored." % vcc;
 234                 sys.stdout.flush();
 235
 236
 237     def vccexplored(self,vcc):
 238         c=self.db.cursor();
 239         c.execute("select vcc from glitches where vcc=? limit 1;",[vcc]);
 240         rows=c.fetchall();
 241         for a in rows:
 242             return True;
 243         c.close();
 244         return False;
 245     def scanat(self,lock,trials,vcc,gnd,time):
 246         client=self.client;
 247         client.glitchRate(time);
 248         client.glitchVoltages(gnd, vcc);  #drop voltage target
 249         gcount=0;
 250         scount=0;
 251         #print "-- (%5i,%5i)" % (time,vcc);
 252         #sys.stdout.flush();
 253         for i in range(0,trials):
 254             client.glitchstart();
 255
 256             #Try to read *0, which is secret if read works.
 257             a=client.eeprompeek(0x0);
 258             if lock>0: #locked
 259                 if(a!=0 and a!=0xFF and a!=self.secret):
 260                     gcount+=1;
 261                 if(a==self.secret):
 262                     print "-- %06i: %02x HELL YEAH! " % (time, a);
 263                     scount+=1;
 264             else: #unlocked
 265                 if(a!=self.secret):
 266                     gcount+=1;
 267                 if(a==self.secret):
 268                     scount+=1;
 269         #print "values (%i,%i,%i,%i,%i);" % (
 270         #    time,vcc,gnd,gcount,scount);
 271         if(lock==0):
 272             self.db.execute("insert into glitches(time,vcc,gnd,trials,glitchcount,count,lock)"
 273                    "values (%i,%i,%i,%i,%i,%i,%i);" % (
 274                 time,vcc,gnd,trials,gcount,scount,lock));
 275         elif scount>0:
 276             print "INSERTING AN EXPLOIT point, t=%i and vcc=%i" % (time,vcc);
 277             self.db.execute("insert into exploits(time,vcc,gnd,trials,count)"
 278                    "values (%i,%i,%i,%i,%i);" % (
 279                 time,vcc,gnd,trials,scount));
 280             self.db.commit(); #Don't leave a lock open.