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Crypto.py
# -*- coding: utf-8 -*- ## -------------------------------------------------------------------- ## Amazon S3 manager ## ## Authors : Michal Ludvig <michal@logix.cz> (https://www.logix.cz/michal) ## Florent Viard <florent@sodria.com> (https://www.sodria.com) ## Copyright : TGRMN Software, Sodria SAS and contributors ## License : GPL Version 2 ## Website : https://s3tools.org ## -------------------------------------------------------------------- from __future__ import absolute_import import sys import hmac try: from base64 import encodebytes as encodestring except ImportError: # Python 2 support from base64 import encodestring from . import Config from logging import debug from .BaseUtils import encode_to_s3, decode_from_s3, s3_quote, md5, unicode from .Utils import time_to_epoch, deunicodise, check_bucket_name_dns_support from .SortedDict import SortedDict import datetime from hashlib import sha1, sha256 __all__ = [] def format_param_str(params, always_have_equal=False, limited_keys=None): """ Format URL parameters from a params dict and returns ?parm1=val1&parm2=val2 or an empty string if there are no parameters. Output of this function should be appended directly to self.resource['uri'] - Set "always_have_equal" to always have the "=" char for a param even when there is no value for it. - Set "limited_keys" list to restrict the param string to keys that are defined in it. """ if not params: return "" param_str = "" equal_str = always_have_equal and u'=' or '' for key in sorted(params.keys()): if limited_keys and key not in limited_keys: continue value = params[key] if value in (None, ""): param_str += "&%s%s" % (s3_quote(key, unicode_output=True), equal_str) else: param_str += "&%s=%s" % (key, s3_quote(params[key], unicode_output=True)) return param_str and "?" + param_str[1:] __all__.append("format_param_str") ### AWS Version 2 signing def sign_string_v2(string_to_sign): """Sign a string with the secret key, returning base64 encoded results. By default the configured secret key is used, but may be overridden as an argument. Useful for REST authentication. See http://s3.amazonaws.com/doc/s3-developer-guide/RESTAuthentication.html string_to_sign should be utf-8 "bytes". and returned signature will be utf-8 encoded "bytes". """ secret_key = Config.Config().secret_key signature = encodestring(hmac.new(encode_to_s3(secret_key), string_to_sign, sha1).digest()).strip() return signature __all__.append("sign_string_v2") def sign_request_v2(method='GET', canonical_uri='/', params=None, cur_headers=None): """Sign a string with the secret key, returning base64 encoded results. By default the configured secret key is used, but may be overridden as an argument. Useful for REST authentication. See http://s3.amazonaws.com/doc/s3-developer-guide/RESTAuthentication.html string_to_sign should be utf-8 "bytes". """ # valid sub-resources to be included in sign v2: SUBRESOURCES_TO_INCLUDE = ['acl', 'lifecycle', 'location', 'logging', 'notification', 'partNumber', 'policy', 'requestPayment', 'tagging', 'torrent', 'uploadId', 'uploads', 'versionId', 'versioning', 'versions', 'website', # Missing of aws s3 doc but needed 'delete', 'cors', 'restore'] if cur_headers is None: cur_headers = SortedDict(ignore_case = True) access_key = Config.Config().access_key string_to_sign = method + "\n" string_to_sign += cur_headers.get("content-md5", "") + "\n" string_to_sign += cur_headers.get("content-type", "") + "\n" string_to_sign += cur_headers.get("date", "") + "\n" for header in sorted(cur_headers.keys()): if header.startswith("x-amz-"): string_to_sign += header + ":" + cur_headers[header] + "\n" if header.startswith("x-emc-"): string_to_sign += header + ":"+ cur_headers[header] + "\n" canonical_uri = s3_quote(canonical_uri, quote_backslashes=False, unicode_output=True) canonical_querystring = format_param_str(params, limited_keys=SUBRESOURCES_TO_INCLUDE) # canonical_querystring would be empty if no param given, otherwise it will # starts with a "?" canonical_uri += canonical_querystring string_to_sign += canonical_uri debug("SignHeaders: " + repr(string_to_sign)) signature = decode_from_s3(sign_string_v2(encode_to_s3(string_to_sign))) new_headers = SortedDict(list(cur_headers.items()), ignore_case=True) new_headers["Authorization"] = "AWS " + access_key + ":" + signature return new_headers __all__.append("sign_request_v2") def sign_url_v2(url_to_sign, expiry): """Sign a URL in s3://bucket/object form with the given expiry time. The object will be accessible via the signed URL until the AWS key and secret are revoked or the expiry time is reached, even if the object is otherwise private. See: http://s3.amazonaws.com/doc/s3-developer-guide/RESTAuthentication.html """ return sign_url_base_v2( bucket = url_to_sign.bucket(), object = url_to_sign.object(), expiry = expiry ) __all__.append("sign_url_v2") def sign_url_base_v2(**parms): """Shared implementation of sign_url methods. Takes a hash of 'bucket', 'object' and 'expiry' as args.""" content_disposition=Config.Config().content_disposition content_type=Config.Config().content_type parms['expiry']=time_to_epoch(parms['expiry']) parms['access_key']=Config.Config().access_key parms['host_base']=Config.Config().host_base parms['object'] = s3_quote(parms['object'], quote_backslashes=False, unicode_output=True) parms['proto'] = 'http' if Config.Config().signurl_use_https: parms['proto'] = 'https' debug("Expiry interpreted as epoch time %s", parms['expiry']) signtext = 'GET\n\n\n%(expiry)d\n/%(bucket)s/%(object)s' % parms param_separator = '?' if content_disposition: signtext += param_separator + 'response-content-disposition=' + content_disposition param_separator = '&' if content_type: signtext += param_separator + 'response-content-type=' + content_type param_separator = '&' debug("Signing plaintext: %r", signtext) parms['sig'] = s3_quote(sign_string_v2(encode_to_s3(signtext)), unicode_output=True) debug("Urlencoded signature: %s", parms['sig']) if check_bucket_name_dns_support(Config.Config().host_bucket, parms['bucket']): url = "%(proto)s://%(bucket)s.%(host_base)s/%(object)s" else: url = "%(proto)s://%(host_base)s/%(bucket)s/%(object)s" url += "?AWSAccessKeyId=%(access_key)s&Expires=%(expiry)d&Signature=%(sig)s" url = url % parms if content_disposition: url += "&response-content-disposition=" + s3_quote(content_disposition, unicode_output=True) if content_type: url += "&response-content-type=" + s3_quote(content_type, unicode_output=True) return url __all__.append("sign_url_base_v2") def sign(key, msg): return hmac.new(key, encode_to_s3(msg), sha256).digest() def getSignatureKey(key, dateStamp, regionName, serviceName): """ Input: unicode params Output: bytes """ kDate = sign(encode_to_s3('AWS4' + key), dateStamp) kRegion = sign(kDate, regionName) kService = sign(kRegion, serviceName) kSigning = sign(kService, 'aws4_request') return kSigning def sign_request_v4(method='GET', host='', canonical_uri='/', params=None, region='us-east-1', cur_headers=None, body=b''): service = 's3' if cur_headers is None: cur_headers = SortedDict(ignore_case = True) cfg = Config.Config() access_key = cfg.access_key secret_key = cfg.secret_key t = datetime.datetime.utcnow() amzdate = t.strftime('%Y%m%dT%H%M%SZ') datestamp = t.strftime('%Y%m%d') signing_key = getSignatureKey(secret_key, datestamp, region, service) canonical_uri = s3_quote(canonical_uri, quote_backslashes=False, unicode_output=True) canonical_querystring = format_param_str(params, always_have_equal=True).lstrip('?') if type(body) == type(sha256(b'')): payload_hash = decode_from_s3(body.hexdigest()) else: payload_hash = decode_from_s3(sha256(encode_to_s3(body)).hexdigest()) canonical_headers = {'host' : host, 'x-amz-content-sha256': payload_hash, 'x-amz-date' : amzdate } signed_headers = 'host;x-amz-content-sha256;x-amz-date' for header in cur_headers.keys(): # avoid duplicate headers and previous Authorization if header == 'Authorization' or header in signed_headers.split(';'): continue canonical_headers[header.strip()] = cur_headers[header].strip() signed_headers += ';' + header.strip() # sort headers into a string canonical_headers_str = '' for k, v in sorted(canonical_headers.items()): canonical_headers_str += k + ":" + v + "\n" canonical_headers = canonical_headers_str debug(u"canonical_headers = %s" % canonical_headers) signed_headers = ';'.join(sorted(signed_headers.split(';'))) canonical_request = method + '\n' + canonical_uri + '\n' + canonical_querystring + '\n' + canonical_headers + '\n' + signed_headers + '\n' + payload_hash debug('Canonical Request:\n%s\n----------------------' % canonical_request) algorithm = 'AWS4-HMAC-SHA256' credential_scope = datestamp + '/' + region + '/' + service + '/' + 'aws4_request' string_to_sign = algorithm + '\n' + amzdate + '\n' + credential_scope + '\n' + decode_from_s3(sha256(encode_to_s3(canonical_request)).hexdigest()) signature = decode_from_s3(hmac.new(signing_key, encode_to_s3(string_to_sign), sha256).hexdigest()) authorization_header = algorithm + ' ' + 'Credential=' + access_key + '/' + credential_scope + ',' + 'SignedHeaders=' + signed_headers + ',' + 'Signature=' + signature new_headers = SortedDict(cur_headers.items()) new_headers.update({'x-amz-date':amzdate, 'Authorization':authorization_header, 'x-amz-content-sha256': payload_hash}) debug("signature-v4 headers: %s" % new_headers) return new_headers __all__.append("sign_request_v4") def checksum_file_descriptor(file_desc, offset=0, size=None, hash_func=sha256): hash = hash_func() if size is None: for chunk in iter(lambda: file_desc.read(8192), b''): hash.update(chunk) else: file_desc.seek(offset) size_left = size while size_left > 0: chunk = file_desc.read(min(8192, size_left)) if not chunk: break size_left -= len(chunk) hash.update(chunk) return hash __all__.append("checksum_file_stream") def checksum_sha256_file(file, offset=0, size=None): if not isinstance(file, unicode): # file is directly a file descriptor return checksum_file_descriptor(file, offset, size, sha256) # Otherwise, we expect file to be a filename with open(deunicodise(file),'rb') as fp: return checksum_file_descriptor(fp, offset, size, sha256) __all__.append("checksum_sha256_file") def checksum_sha256_buffer(buffer, offset=0, size=None): hash = sha256() if size is None: hash.update(buffer) else: hash.update(buffer[offset:offset+size]) return hash __all__.append("checksum_sha256_buffer") def generate_content_md5(body): m = md5(encode_to_s3(body)) base64md5 = encodestring(m.digest()) base64md5 = decode_from_s3(base64md5) if base64md5[-1] == '\n': base64md5 = base64md5[0:-1] return decode_from_s3(base64md5) __all__.append("generate_content_md5") def hash_file_md5(filename): h = md5() with open(deunicodise(filename), "rb") as fp: while True: # Hash 32kB chunks data = fp.read(32*1024) if not data: break h.update(data) return h.hexdigest() __all__.append("hash_file_md5") def calculateChecksum(buffer, mfile, offset, chunk_size, send_chunk): md5_hash = md5() size_left = chunk_size if buffer == '': mfile.seek(offset) while size_left > 0: data = mfile.read(min(send_chunk, size_left)) if not data: break md5_hash.update(data) size_left -= len(data) else: md5_hash.update(buffer) return md5_hash.hexdigest() __all__.append("calculateChecksum")
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