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sobelow.ex
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defmodule Sobelow do
@moduledoc """
Sobelow is a static analysis tool for discovering
vulnerabilities in Phoenix applications.
"""
@v Mix.Project.config()[:version]
@home "~/.sobelow"
@vsncheck "sobelow-vsn-check"
@skips ".sobelow-skips"
@submodules [
Sobelow.XSS,
Sobelow.SQL,
Sobelow.Traversal,
Sobelow.RCE,
Sobelow.Misc,
Sobelow.Config,
Sobelow.CI,
Sobelow.DOS,
Sobelow.Vuln
]
alias Sobelow.Config
alias Sobelow.Finding
alias Sobelow.FindingLog
alias Sobelow.Fingerprint
alias Sobelow.IO, as: MixIO
alias Sobelow.MetaLog
alias Sobelow.Parse
alias Sobelow.Utils
alias Sobelow.Vuln
def run do
project_root = get_env(:root) <> "/"
version_check()
app_name = Utils.get_app_name(project_root <> "mix.exs")
if !is_binary(app_name), do: file_error()
# If web_root ends with the app_name, then it is the
# more recent version of Phoenix. Meaning, all files are
# in the lib directory, so we don't need to re-scan
# lib_root separately.
phx_post_1_2? = !File.dir?(project_root <> "web")
lib_root =
if phx_post_1_2? do
project_root <> "lib"
else
project_root <> "web"
end
ignored = get_ignored()
allowed = @submodules -- ignored
# Pulling out function definitions before kicking
# off the test pipeline to avoid dumping warning
# messages into the findings output.
root_meta_files = get_meta_files(lib_root)
template_meta_files = get_meta_templates(lib_root)
{libroot_meta_files, tmp_default_router} =
if phx_post_1_2? do
{[], ""}
else
libroot_meta_files = get_meta_files(project_root <> "lib")
default_router = project_root <> "/web/router.ex"
{libroot_meta_files, default_router}
end
default_router = get_router(tmp_default_router, phx_post_1_2?)
{routers, endpoints} =
get_phoenix_files(root_meta_files ++ libroot_meta_files, default_router)
if Enum.empty?(routers), do: no_router()
init_state(project_root, template_meta_files)
if get_env(:clear_skip), do: clear_skip(project_root)
# This is where the core testing-pipeline starts.
#
# - Print banner
# - Check configuration
# - Remove config check from "allowed" modules
# - Scan funcs from the root
# - Scan funcs from the libroot
if format() not in ["quiet", "compact", "flycheck", "json"],
do: IO.puts(:stderr, print_banner())
Application.put_env(:sobelow, :app_name, app_name)
if Enum.member?(allowed, Config), do: Config.fetch(project_root, routers, endpoints)
if Enum.member?(allowed, Vuln), do: Vuln.get_vulns(project_root)
allowed = allowed -- [Config, Vuln]
Enum.each(root_meta_files, fn meta_file ->
meta_file.def_funs
|> combine_skips()
|> Enum.each(&get_fun_vulns(&1, meta_file, project_root, allowed))
end)
Enum.each(libroot_meta_files, fn meta_file ->
meta_file.def_funs
|> combine_skips()
|> Enum.each(&get_fun_vulns(&1, meta_file, "", allowed))
end)
Enum.each(template_meta_files, fn {_, meta_file} ->
if Sobelow.XSS in allowed, do: Sobelow.XSS.get_template_vulns(meta_file)
end)
# Enum.each(template_meta_files, fn {_, meta_file} ->
# get_fun_vulns(meta_file.ast, meta_file, root, allowed)
# end)
if format() != "txt" do
print_output()
else
IO.puts(:stderr, "... SCAN COMPLETE ...\n")
end
if get_env(:mark_skip_all), do: mark_skip_all(project_root)
exit_with_status()
end
defp init_state(project_root, template_meta_files) do
FindingLog.start_link()
MetaLog.start_link()
Fingerprint.start_link()
load_ignored_fingerprints(project_root)
MetaLog.add_templates(template_meta_files)
end
defp print_output do
details =
case output_format() do
"json" ->
FindingLog.json(@v)
"quiet" ->
FindingLog.quiet()
"sarif" ->
FindingLog.sarif(@v)
_ ->
nil
end
if !is_nil(details) do
print_std_or_file(details)
end
end
defp print_std_or_file(details) do
case get_env(:out) do
nil -> IO.puts(details)
"" -> IO.puts(details)
out -> File.write(out, details)
end
end
defp exit_with_status do
exit_on = get_env(:exit_on)
finding_logs = FindingLog.log()
high_count = length(finding_logs[:high])
medium_count = length(finding_logs[:medium])
low_count = length(finding_logs[:low])
status =
case exit_on do
:high ->
if high_count > 0, do: 1
:medium ->
if high_count + medium_count > 0, do: 1
:low ->
if high_count + medium_count + low_count > 0, do: 1
_ ->
0
end
if exit_on && !is_nil(status) do
System.halt(status)
end
end
def details do
mod =
get_env(:details)
|> get_mod
if is_nil(mod) do
MixIO.error("A valid module was not selected.")
else
apply(mod, :details, []) |> IO.puts()
end
end
def log_finding(%Finding{} = finding) do
log_finding(finding.type, finding)
end
def log_finding(details, %Finding{} = finding) do
if loggable?(finding.fingerprint, finding.confidence) do
Fingerprint.put(finding.fingerprint)
FindingLog.add({details, finding}, finding.confidence)
end
end
def loggable?(fingerprint, severity) do
!(get_env(:skip) && Fingerprint.member?(fingerprint)) &&
meets_threshold?(severity)
end
def all_details do
@submodules
|> Enum.map(&apply(&1, :details, []))
|> List.flatten()
|> Enum.each(&IO.puts(&1))
end
def rules do
@submodules
|> Enum.flat_map(&apply(&1, :rules, []))
end
def finding_modules do
@submodules
|> Enum.flat_map(&apply(&1, :finding_modules, []))
end
def save_config(conf_file) do
conf = [
verbose: get_env(:verbose),
private: get_env(:private),
skip: get_env(:skip),
router: get_env(:router),
exit: get_env(:exit_on),
format: get_env(:format),
out: get_env(:out),
threshold: get_env(:threshold),
ignore: get_env(:ignored),
ignore_files: get_env(:ignored_files),
version: get_env(:version)
]
yes? =
if File.exists?(conf_file) do
MixIO.yes?("The file .sobelow-conf already exists. Are you sure you want to overwrite?")
else
true
end
if yes? do
File.write!(conf_file, inspect(conf))
MixIO.info("Updated .sobelow-conf")
end
end
def meets_threshold?(severity) do
threshold =
case get_env(:threshold) do
:high -> [:high]
:medium -> [:high, :medium]
_ -> [:high, :medium, :low]
end
severity in threshold
end
def format do
case get_env(:format) do
"sarif" -> "json"
format -> format
end
end
def output_format do
get_env(:format)
end
def get_env(key) do
Application.get_env(:sobelow, key)
end
defp print_banner do
"""
##############################################
# #
# Running Sobelow - v#{@v} #
# Created by Griffin Byatt - @griffinbyatt #
# NCC Group - https://nccgroup.trust #
# #
##############################################
"""
end
defp get_router("", true) do
case get_env(:router) do
nil -> ""
"" -> ""
router -> Path.expand(router)
end
end
defp get_router(tmp_default_router, _) do
case get_env(:router) do
nil -> tmp_default_router
"" -> tmp_default_router
router -> router
end
|> Path.expand()
end
defp get_phoenix_files(meta_files, router) do
phoenix_files =
Enum.reduce(meta_files, %{routers: [], endpoints: []}, fn meta_file, acc ->
cond do
meta_file.router? ->
Map.update!(acc, :routers, &[meta_file.file_path | &1])
meta_file.is_endpoint? ->
Map.update!(acc, :endpoints, &[meta_file.file_path | &1])
true ->
acc
end
end)
uniq_phoenix_files =
if File.exists?(router) do
Map.update!(phoenix_files, :routers, fn routers ->
Enum.uniq(routers ++ [router])
end)
else
phoenix_files
end
{uniq_phoenix_files.routers, uniq_phoenix_files.endpoints}
end
defp get_meta_templates(root) do
ignored_files = get_env(:ignored_files)
Utils.template_files(root)
|> Enum.reject(&ignored_file?(&1, ignored_files))
|> Enum.map(&get_template_meta/1)
|> Map.new()
end
defp get_template_meta(filename) do
meta_funs = Parse.get_meta_template_funs(filename)
raw = meta_funs.raw
ast = meta_funs.ast
filename = Utils.normalize_path(filename)
{
filename,
%{
filename: filename,
raw: raw,
ast: [ast],
controller?: false
}
}
end
defp get_meta_files(root) do
ignored_files = get_env(:ignored_files)
Utils.all_files(root)
|> Enum.reject(&ignored_file?(&1, ignored_files))
|> Enum.map(&get_file_meta/1)
end
defp get_file_meta(filename) do
ast = Parse.ast(filename)
meta_funs = Parse.get_meta_funs(ast)
def_funs = meta_funs.def_funs
use_funs = meta_funs.use_funs
%{
filename: Utils.normalize_path(filename),
file_path: Path.expand(filename),
def_funs: def_funs,
controller?: Utils.controller?(use_funs),
router?: Utils.router?(use_funs),
is_endpoint?: Utils.endpoint?(use_funs)
}
end
defp get_fun_vulns({fun, skips}, meta_file, web_root, mods) do
skip_mods =
skips
|> Enum.map(&get_mod/1)
Enum.each(mods -- skip_mods, fn mod ->
params = [fun, meta_file, web_root, skip_mods]
apply(mod, :get_vulns, params)
end)
end
defp get_fun_vulns(fun, meta_file, web_root, mods) do
get_fun_vulns({fun, []}, meta_file, web_root, mods)
end
defp combine_skips([]), do: []
defp combine_skips([head | tail] = funs) do
if get_env(:skip), do: combine_skips(head, tail), else: funs
end
defp combine_skips(prev, []), do: [prev]
defp combine_skips(prev, [{:@, _, [{:sobelow_skip, _, [skips]}]} | []]), do: [{prev, skips}]
defp combine_skips(prev, [{:@, _, [{:sobelow_skip, _, [skips]}]} | tail]) do
[h | t] = tail
[{prev, skips} | combine_skips(h, t)]
end
defp combine_skips(prev, rest) do
[h | t] = rest
[prev | combine_skips(h, t)]
end
defp no_router do
message = """
WARNING: Sobelow cannot find the router. If this is a Phoenix application
please use the `--router` flag to specify the router's location.
"""
IO.puts(:stderr, message)
ignored = get_env(:ignored)
Application.put_env(
:sobelow,
:ignored,
ignored ++ ["Config.CSRF", "Config.CSRFRoute", "Config.Headers", "Config.CSP"]
)
end
defp file_error do
message = """
This does not appear to be a Phoenix application. If this is an Umbrella application,
each application should be scanned separately.
"""
MixIO.error(message)
System.halt(0)
end
defp clear_skip(project_root) do
cfile = project_root <> @skips
if File.exists?(cfile) do
File.rm!(cfile)
end
System.halt(0)
end
defp mark_skip_all(project_root) do
cfile = project_root <> @skips
case Fingerprint.new_skips() do
[] ->
nil
fingerprints ->
{:ok, iofile} = :file.open(cfile, [:append])
fingerprints = Enum.join(fingerprints, "\n")
:file.write(iofile, ["\n", fingerprints])
:file.close(iofile)
end
end
defp load_ignored_fingerprints(project_root) do
cfile = project_root <> @skips
if File.exists?(cfile) do
{:ok, iofile} = :file.open(cfile, [:read])
:file.read_line(iofile) |> load_ignored_fingerprints(iofile)
:file.close(iofile)
end
end
defp load_ignored_fingerprints({:ok, fingerprint}, iofile) do
to_string(fingerprint) |> String.trim() |> Fingerprint.put_ignore()
:file.read_line(iofile) |> load_ignored_fingerprints(iofile)
end
defp load_ignored_fingerprints(:eof, _), do: nil
defp load_ignored_fingerprints(_, _), do: nil
defp version_check do
config =
System.get_env("SOBELOW_HOME") ||
@home
|> Path.expand()
|> Path.join(@vsncheck)
home = Path.dirname(config)
if File.exists?(home) do
version_check(config)
else
File.mkdir_p!(home)
version_check(config)
end
end
defp version_check(config) do
time = DateTime.utc_now() |> DateTime.to_unix()
if File.exists?(config) do
{:ok, iofile} = :file.open(config, [:read])
{timestamp, _} =
case :file.read_line(iofile) do
{:ok, ~c"sobelow-" ++ timestamp} -> to_string(timestamp) |> Integer.parse()
_ -> file_error()
end
:file.close(iofile)
if time - 12 * 60 * 60 > timestamp do
maybe_prompt_update(time, config)
end
else
maybe_prompt_update(time, config)
end
end
defp get_sobelow_version do
{:ok, _} = Application.ensure_all_started(:ssl)
{:ok, _} = Application.ensure_all_started(:inets)
{:ok, _} = :inets.start(:httpc, [{:profile, :sobelow}])
url = ~c"https://sobelow.io/version"
http_options = [
ssl: [
verify: :verify_none
# We cannot use exclusively use OTP 25+ yet, but when we can - uncomment the following few lines
# verify: :verify_peer,
# cacertfile: :public_key.cacerts_get()
],
timeout: 10_000
]
IO.puts(:stderr, "Checking Sobelow version...\n")
case :httpc.request(:get, {url, []}, http_options, []) do
{:ok, {{_, 200, _}, _, vsn}} ->
Version.parse!(String.trim(to_string(vsn)))
_ ->
MixIO.error("Error fetching version number.\n")
@v
end
after
:inets.stop(:httpc, :sobelow)
end
defp maybe_prompt_update(time, cfile) do
installed_vsn = Version.parse!(@v)
unless get_env(:private) do
cmp =
get_sobelow_version()
|> Version.compare(installed_vsn)
case cmp do
:gt ->
MixIO.error("""
A new version of Sobelow is available:
mix archive.install hex sobelow
""")
_ ->
nil
end
end
timestamp = "sobelow-" <> to_string(time)
case :file.open(cfile, [:write, :read]) do
{:ok, iofile} ->
:ok = :file.pwrite(iofile, 0, timestamp)
:ok = :file.close(iofile)
_ ->
File.write(cfile, timestamp)
end
end
def get_mod(mod_string) do
case mod_string do
"XSS" -> Sobelow.XSS
"XSS.Raw" -> Sobelow.XSS.Raw
"XSS.SendResp" -> Sobelow.XSS.SendResp
"XSS.ContentType" -> Sobelow.XSS.ContentType
"XSS.HTML" -> Sobelow.XSS.HTML
"SQL" -> Sobelow.SQL
"SQL.Query" -> Sobelow.SQL.Query
"SQL.Stream" -> Sobelow.SQL.Stream
"Misc" -> Sobelow.Misc
"Misc.BinToTerm" -> Sobelow.Misc.BinToTerm
"Misc.FilePath" -> Sobelow.Misc.FilePath
"RCE" -> Sobelow.RCE
"RCE.EEx" -> Sobelow.RCE.EEx
"RCE.CodeModule" -> Sobelow.RCE.CodeModule
"Config" -> Sobelow.Config
"Config.CSRF" -> Sobelow.Config.CSRF
"Config.CSRFRoute" -> Sobelow.Config.CSRFRoute
"Config.Headers" -> Sobelow.Config.Headers
"Config.CSP" -> Sobelow.Config.CSP
"Config.Secrets" -> Sobelow.Config.Secrets
"Config.HTTPS" -> Sobelow.Config.HTTPS
"Config.HSTS" -> Sobelow.Config.HSTS
"Config.CSWH" -> Sobelow.Config.CSWH
"Vuln" -> Sobelow.Vuln
"Vuln.CookieRCE" -> Sobelow.Vuln.CookieRCE
"Vuln.HeaderInject" -> Sobelow.Vuln.HeaderInject
"Vuln.PlugNull" -> Sobelow.Vuln.PlugNull
"Vuln.Redirect" -> Sobelow.Vuln.Redirect
"Vuln.Coherence" -> Sobelow.Vuln.Coherence
"Vuln.Ecto" -> Sobelow.Vuln.Ecto
"Traversal" -> Sobelow.Traversal
"Traversal.SendFile" -> Sobelow.Traversal.SendFile
"Traversal.FileModule" -> Sobelow.Traversal.FileModule
"Traversal.SendDownload" -> Sobelow.Traversal.SendDownload
"CI" -> Sobelow.CI
"CI.System" -> Sobelow.CI.System
"CI.OS" -> Sobelow.CI.OS
"DOS" -> Sobelow.DOS
"DOS.StringToAtom" -> Sobelow.DOS.StringToAtom
"DOS.ListToAtom" -> Sobelow.DOS.ListToAtom
"DOS.BinToAtom" -> Sobelow.DOS.BinToAtom
_ -> nil
end
end
def get_ignored do
get_env(:ignored)
|> Enum.map(&get_mod/1)
end
def vuln?({vars, _, _}) do
if Enum.empty?(vars) do
false
else
true
end
end
defp ignored_file?(filename, ignored_files) do
Enum.any?(ignored_files, fn ignored_file ->
String.ends_with?(ignored_file, filename)
end)
end
def version do
@v
|> IO.puts()
end
end