Commit fb980849 authored by Mark Haines's avatar Mark Haines
Browse files

Add gdb script and psuedo-call graph generator python script for tracing calls to crypto primitives

parent 0ca3797d
Tracing
=======
To see what crypto functions are being called with what input run
.. code:: bash
gdb --batch -x tracing/trace.gdb ./build/test_ratchet | grep "^[- ]" | tr "{}" "[]" | tracing/graph.py
#! /usr/bin/python
import sys
import yaml
import array
class Call(object):
def __init__(self, call):
self.func, = call
args = dict(call[self.func])
self.output = array.array("B", args.pop("output")).tostring()
self.inputs = {
name: array.array("B", args[name]).tostring()
for name in args
if not name.endswith("_length")
}
self.bind = {}
def expr(self, stream, indent=" ", level=""):
stream.write(self.func + "(\n")
for name, value in self.inputs.items():
stream.write(level + indent + name + "=")
self.bind.get(name, Literal(value)).expr(
stream, indent, level + indent
)
stream.write(",\n")
stream.write(level + ")")
class Literal(str):
def expr(self, stream, indent, level):
stream.write("\"" + self.encode("hex") + "\"")
class Slice(object):
def __init__(self, thing, start, end):
self.thing = thing
self.start = start
self.end = end
def expr(self, stream, indent=" ", level=""):
self.thing.expr(stream, indent, level)
stream.write("[%d:%d]" % (self.start, self.end))
class Concat(list):
def expr(self, stream, indent=" ", level=""):
stream.write("concat(\n")
for thing in self:
stream.write(level + indent)
thing.expr(stream, indent, level + indent)
stream.write(",\n")
stream.write(level + ")")
calls = [Call(c) for c in yaml.load(sys.stdin)]
outputs = {}
for call in calls:
for i in range(8, len(call.output)):
outputs.setdefault(call.output[i - 8: i], []).append(call)
for call in calls:
for name, value in call.inputs.items():
for bind in outputs.get(value[:8], ()):
if value == bind.output:
call.bind[name] = bind
else:
for end in range(len(value), len(bind.output) + 1):
start = end - len(value)
if value == bind.output[start:end]:
call.bind[name] = Slice(bind, start, end)
if not name in call.bind:
i = 0
j = 1
k = 0
concat = Concat()
while i < len(value):
for bind in outputs.get(value[i:i+8], ()):
if value[i:].startswith(bind.output):
if k != i:
concat.append(Literal(value[k:i]))
concat.append(bind)
j = len(bind.output)
k = i + j
break
i += j
j = 1
if concat:
if k != i:
concat.append(Literal(value[k:i]))
call.bind[name] = concat
for call in calls:
if call.func.startswith("h"):
sys.stdout.write("\"" + call.output.encode("hex") + "\" = ")
call.expr(sys.stdout)
sys.stdout.write("\n")
set print pretty off
set print repeats unlimited
set print elements unlimited
set breakpoint pending on
break crypto.cpp:273
commands
silent
printf "- hmac_sha256:\n"
printf " key_length: %d\n", key_length
printf " input_length: %d\n", input_length
if key_length > 0
printf " key: "
output/x *key@key_length
printf "\n"
else
printf " key: {}\n"
end
if input_length > 0
printf " input: "
output/x *input@input_length
printf "\n"
else
printf " input: {}\n"
end
cont
end
break crypto.cpp:280
commands
silent
printf " output: "
output/x *output@32
printf "\n"
cont
end
break crypto.cpp:307
commands
silent
set $hkdf_output = output
cont
end
break crypto.cpp:323
commands
silent
printf "- hkdf_sha256:\n"
printf " input_length: %d\n", input_length
printf " salt_length: %d\n", salt_length
printf " info_length: %d\n", info_length
printf " output_length: %d\n", output_length
if input_length > 0
printf " input: "
output/x *input@input_length
printf "\n"
else
printf " input: {}\n"
end
if salt_length > 0
printf " salt: "
output/x *salt@salt_length
printf "\n"
else
printf " salt: {}\n"
end
if info_length > 0
printf " info: "
output/x *info@info_length
printf "\n"
else
printf " info: {}\n"
end
printf " output: "
output/x *$hkdf_output@output_length
printf "\n"
cont
end
break crypto.cpp:156
commands
silent
printf "- curve25519:\n"
printf " public: "
output/x *their_key.public_key@32
printf "\n"
printf " private: "
output/x *our_key.private_key@32
printf "\n"
printf " output: "
output/x *output@32
printf "\n"
cont
end
break crypto.cpp:156
commands
silent
printf "- curve25519:\n"
printf " public: "
output/x *their_key.public_key@32
printf "\n"
printf " private: "
output/x *our_key.private_key@32
printf "\n"
printf " output: "
output/x *output@32
printf "\n"
cont
end
break crypto.cpp:147
commands
silent
printf "- curve25519:\n"
printf " public: "
output/x *CURVE25519_BASEPOINT@32
printf "\n"
printf " private: "
output/x *key_pair.private_key@32
printf "\n"
printf " output: "
output/x *key_pair.public_key@32
printf "\n"
cont
end
run
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