euscan-ng/pym/euscan/handlers/generic.py

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from urlparse import urljoin, urlparse
import urllib2
import re
import StringIO
import difflib
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try:
from BeautifulSoup import BeautifulSoup
except ImportError:
from bs4 import BeautifulSoup
import portage
from euscan import output, helpers, mangling, CONFIG, SCANDIR_BLACKLIST_URLS, \
BRUTEFORCE_BLACKLIST_PACKAGES, BRUTEFORCE_BLACKLIST_URLS
HANDLER_NAME = "generic"
CONFIDENCE = 45
PRIORITY = 0
BRUTEFORCE_HANDLER_NAME = "brute_force"
BRUTEFORCE_CONFIDENCE = 30
def confidence_score(found, original, minimum=CONFIDENCE):
found_p = urlparse(found)
original_p = urlparse(original)
# check if the base url is the same
if found_p.netloc != original_p.netloc:
return minimum
# check if the directory depth is the same
if len(found_p.path.split("/")) != len(original_p.path.split("/")):
return minimum
# strip numbers
found_path = re.sub(r"[\d+\.]?", "", found_p.path)
original_path = re.sub(r"[\d+\.]?", "", original_p.path)
# strip the first equal part of the path
i = 0
max_i = len(found_path)
while i < max_i and found_path[i] == original_path[i]:
i += 1
found_path = found_path[i:]
original_path = original_path[i:]
# calculate difference ratio
diff = difflib.SequenceMatcher(None, found_path, original_path).ratio()
return int(minimum + minimum * diff) # maximum score is minimum * 2
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def scan_html(data, url, pattern):
soup = BeautifulSoup(data)
results = []
for link in soup.findAll('a'):
href = link.get("href")
if not href:
continue
if href.startswith(url):
href = href.replace(url, "", 1)
match = re.search(pattern, href, re.I)
if match:
results.append(
(".".join([x for x in match.groups() if x is not None]),
match.group(0))
)
return results
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def scan_ftp(data, url, pattern):
buf = StringIO.StringIO(data)
results = []
for line in buf.readlines():
line = line.replace("\n", "").replace("\r", "")
match = re.search(pattern, line, re.I)
if match:
results.append(
(".".join([x for x in match.groups() if x is not None]),
match.group(0))
)
return results
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def scan_directory_recursive(cp, ver, rev, url, steps, orig_url, options):
if not steps:
return []
url += steps[0][0]
pattern = steps[0][1]
steps = steps[1:]
output.einfo("Scanning: %s" % url)
try:
fp = helpers.urlopen(url)
except urllib2.URLError:
return []
except IOError:
return []
if not fp:
return []
data = fp.read()
results = []
if re.search("<\s*a\s+[^>]*href", data, re.I):
results.extend(scan_html(data, url, pattern))
elif url.startswith('ftp://'):
results.extend(scan_ftp(data, url, pattern))
versions = []
for up_pv, path in results:
pv = mangling.mangle_version(up_pv, options)
if helpers.version_filtered(cp, ver, pv):
continue
if not url.endswith("/"):
url = url + "/"
path = urljoin(url, path)
if not steps and path not in orig_url:
confidence = confidence_score(path, orig_url)
path = mangling.mangle_url(path, options)
versions.append((path, pv, HANDLER_NAME, confidence))
if steps:
ret = scan_directory_recursive(cp, ver, rev, path, steps, orig_url,
options)
versions.extend(ret)
return versions
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def scan_url(pkg, url, options):
if CONFIG["scan-dir"]:
for bu in SCANDIR_BLACKLIST_URLS:
if re.match(bu, url):
output.einfo("%s is blacklisted by rule %s" % (url, bu))
return []
resolved_url = helpers.parse_mirror(url)
if not resolved_url:
return []
cp, ver, rev = portage.pkgsplit(pkg.cpv)
# 'Hack' for _beta/_rc versions where _ is used instead of -
if ver not in resolved_url:
newver = helpers.version_change_end_sep(ver)
if newver and newver in resolved_url:
output.einfo(
"Version: using %s instead of %s" % (newver, ver)
)
ver = newver
template = helpers.template_from_url(resolved_url, ver)
if '${' not in template:
output.einfo(
"Url doesn't seems to depend on version: %s not found in %s" %
(ver, resolved_url)
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)
return []
else:
output.einfo("Scanning: %s" % template)
steps = helpers.generate_scan_paths(template)
ret = scan_directory_recursive(cp, ver, rev, "", steps, url, options)
if not ret:
ret = brute_force(pkg, url)
return ret
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def brute_force(pkg, url):
if CONFIG["brute-force"] == 0:
return []
cp, ver, rev = portage.pkgsplit(pkg.cpv)
url = helpers.parse_mirror(url)
if not url:
return []
for bp in BRUTEFORCE_BLACKLIST_PACKAGES:
if re.match(bp, cp):
output.einfo("%s is blacklisted by rule %s" % (cp, bp))
return []
for bp in BRUTEFORCE_BLACKLIST_URLS:
if re.match(bp, url):
output.einfo("%s is blacklisted by rule %s" % (cp, bp))
return []
output.einfo("Generating version from " + ver)
components = helpers.split_version(ver)
versions = helpers.gen_versions(components, CONFIG["brute-force"])
# Remove unwanted versions
for v in versions:
if helpers.vercmp(cp, ver, helpers.join_version(v)) >= 0:
versions.remove(v)
if not versions:
output.einfo("Can't generate new versions from " + ver)
return []
template = helpers.template_from_url(url, ver)
if '${PV}' not in template:
output.einfo(
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"Url doesn't seems to depend on full version: %s not found in %s" %
(ver, url))
return []
else:
output.einfo("Brute forcing: %s" % template)
result = []
i = 0
done = []
while i < len(versions):
components = versions[i]
i += 1
if components in done:
continue
done.append(tuple(components))
version = helpers.join_version(components)
if helpers.version_filtered(cp, ver, version):
continue
try_url = helpers.url_from_template(template, version)
infos = helpers.tryurl(try_url, template)
if not infos:
continue
confidence = confidence_score(try_url, url,
minimum=BRUTEFORCE_CONFIDENCE)
result.append([try_url, version, BRUTEFORCE_HANDLER_NAME, confidence])
if len(result) > CONFIG['brute-force-false-watermark']:
output.einfo(
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"Broken server detected ! Skipping brute force."
)
return []
if CONFIG["brute-force-recursive"]:
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for v in helpers.gen_versions(list(components),
CONFIG["brute-force"]):
if v not in versions and tuple(v) not in done:
versions.append(v)
if CONFIG["oneshot"]:
break
return result
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def can_handle(pkg, url):
return True