Merge tag 'pull-sploit-rev' of https://github.com/Dusoleil/lib-des-gnux

Add rev for basic reverse engineering

* tag 'pull-sploit-rev' of https://github.com/Dusoleil/lib-des-gnux:
  sploit: Move __attr_filter__ to a general place in util
  sploit: Filter all magic python members by default in mem module
  sploit: add stack base pointer to locals symtbl
  sploit: print hex of addresses in rev logs
  sploit: add status logging to rev module
  sploit: lazy load libs for ELF
  sploit: cache results of external commands
  sploit: add the rest of r2 functions through elf
  sploit: typo fix in rev.r2
  sploit: cache ELF loads
  sploit: add ELF helper class to rev
  sploit: consolidate r2 symbol search calls
  sploit: fix r2 module syntax error
  sploit: reverse direction of r2 get_locals offsets
  sploit: add r2 funcionality to rev module
  sploit: add ldd ability to rev module
  sploit: add rev module to sploit

1 files changed, 94 insertions, 0 deletions

diff --git a/sploit/rev/r2.py b/sploit/rev/r2.py
new file mode 100644
index 0000000..bb3edb3
--- /dev/null
+++ b/sploit/rev/r2.py
@@ -0,0 +1,94 @@
+from sploit.mem import Symtbl
+from sploit.arch import arch
+from sploit.util import run_cmd_cached
+from sploit.log import ilog
+
+import re
+from collections import namedtuple as nt
+
+def run_cmd(binary,cmd):
+    return run_cmd_cached(['r2','-q','-c',cmd,'-e','scr.color=false',binary])
+
+def get_elf_symbols(elf):
+    ilog(f'Retrieving symbols of {elf} with r2...')
+    out = {}
+
+    cmd_syms = 'is'
+    out_syms = run_cmd(elf,cmd_syms)
+    out_syms = [re.split(r'\s+',sym) for sym in out_syms][4:]
+    out_syms = [sym for sym in out_syms if sym[6].find('.')<0]
+    out_syms = [sym for sym in out_syms if sym[4]=='FUNC' or sym[4]=='LOOS' or sym[4]=='TLS']
+    out_syms = {sym[6]:int(sym[2],0) for sym in out_syms}
+    out.update(out_syms)
+
+    cmd_syms = 'ii~ FUNC '
+    out_syms = run_cmd(elf,cmd_syms)
+    out_syms = [re.split(r'\s+',sym) for sym in out_syms]
+    out_syms = {"_PLT_"+sym[4]:int(sym[1],0) for sym in out_syms}
+    out.update(out_syms)
+
+    cmd_syms = 'fs relocs;f'
+    out_syms = run_cmd(elf,cmd_syms)
+    out_syms = [re.split(r'\s+',sym) for sym in out_syms]
+    out_syms = {"_GOT_"+sym[2][sym[2].rfind('.')+1:]:int(sym[0],0) for sym in out_syms}
+    out.update(out_syms)
+
+    cmd_strs = 'fs strings;f'
+    out_strs = run_cmd(elf,cmd_strs)
+    out_strs = [re.split(r'\s+',sym) for sym in out_strs]
+    out_strs = {sym[2][sym[2].rfind('.')+1:]:int(sym[0],0) for sym in out_strs}
+    out.update(out_strs)
+
+    return Symtbl(**out)
+
+def get_locals(binary,func):
+    ilog(f'Retrieving local stack frame of {hex(func)} in {binary} with r2...')
+
+    addr = hex(func)
+    cmd_locals = f's {func};af;aafr;aaft;afvf'
+    out = run_cmd(binary,cmd_locals)
+    out = [re.split(r':?\s+',var) for var in out]
+    out = {var[1]:-(int(var[0],0)-arch.wordsize) for var in out}
+    out = Symtbl(**out)
+    out.sbp = 0
+    return out
+
+def ret_gadget(binary):
+    ilog(f'Searching for a ret gadget in {binary} with r2...')
+
+    cmd_ret = '/R/ ret~ret'
+    out = run_cmd(binary,cmd_ret)
+    out = out[0]
+    out = re.split(r'\s+',out)
+    out = out[1]
+    return int(out,0)
+
+def rop_gadget(binary,gad):
+    ilog(f'Searching for "{gad}" gadgets in {binary} with r2...')
+
+    cmd_gad = f'"/R/q {gad}"'
+    out = run_cmd(binary,cmd_gad)
+    Gad = nt("Gad", "addr asm")
+    out = [Gad(int(gad[:gad.find(':')],0),gad[gad.find(':')+2:]) for gad in out]
+    return out
+
+def rop_gadget_exact(binary,gad):
+    gads = rop_gadget(binary,gad)
+    for g in gads:
+        if g.asm[:-1].replace('; ',';') == gad:
+            return g
+
+def get_call_returns(binary,xref_from,xref_to):
+    ilog(f'Getting return addresses of calls from {hex(xref_from)} to {hex(xref_to)} in {binary} with r2...')
+
+    cmd_xrefs = f's {hex(xref_from)};af;axq'
+    xrefs = run_cmd(binary,cmd_xrefs)
+    xrefs = [re.split(r'\s+',x) for x in xrefs]
+    xrefs = [x for x in xrefs if int(x[2],0)==xref_to]
+    rets = []
+    CallRet = nt("CallRet", "xref_from xref_to call_addr ret_addr")
+    for x in xrefs:
+        cmd_ret = f's {x[0]};so;s'
+        ret = run_cmd(binary,cmd_ret)
+        rets.append(CallRet(xref_from,xref_to,int(x[0],0),int(ret[0],0)))
+    return rets