From 85d0b28666a9533aa9dcc3a40ed8de4a38ee0ca1 Mon Sep 17 00:00:00 2001 From: Wassilios Lytras Date: Fri, 22 Jul 2022 20:10:09 +0200 Subject: [PATCH 1/2] Added partner setting to force canonicalize binary. --- pyas2lib/as2.py | 5 ++++- pyas2lib/utils.py | 9 +++++---- 2 files changed, 9 insertions(+), 5 deletions(-) diff --git a/pyas2lib/as2.py b/pyas2lib/as2.py index 9eadd4e..cd2d915 100644 --- a/pyas2lib/as2.py +++ b/pyas2lib/as2.py @@ -177,6 +177,8 @@ class Partner: :param mdn_confirm_text: The text to be used in the MDN for successfully processed messages received from this partner. + :param canonicalize_as_binary: force binary canonicalization for this partner + """ as2_name: str @@ -194,6 +196,7 @@ class Partner: mdn_digest_alg: str = None mdn_confirm_text: str = MDN_CONFIRM_TEXT ignore_self_signed: bool = True + canonicalize_as_binary: bool = False def __post_init__(self): """Run the post initialisation checks for this class.""" @@ -638,7 +641,7 @@ def parse(self, raw_content, find_org_cb, find_partner_cb, find_message_cb=None) # Verify the message, first using raw message and if it fails # then convert to canonical form and try again - mic_content = canonicalize(self.payload) + mic_content = canonicalize(self.payload, canonicalize_as_binary=self.sender.canonicalize_as_binary) verify_cert = self.sender.load_verify_cert() self.digest_alg = verify_message(mic_content, signature, verify_cert) diff --git a/pyas2lib/utils.py b/pyas2lib/utils.py index 5947c55..5a2e999 100644 --- a/pyas2lib/utils.py +++ b/pyas2lib/utils.py @@ -48,8 +48,8 @@ def _handle_text(self, msg): newline replacements. """ if ( - msg.get_content_type() == "application/octet-stream" - or msg.get("Content-Transfer-Encoding") == "binary" + msg.get_content_type() == "application/octet-stream" + or msg.get("Content-Transfer-Encoding") == "binary" ): payload = msg.get_payload(decode=True) if payload is None: @@ -75,15 +75,16 @@ def mime_to_bytes(msg: message.Message, email_policy: policy.Policy = policy.HTT return fp.getvalue() -def canonicalize(email_message: message.Message): +def canonicalize(email_message: message.Message, canonicalize_as_binary: bool = False): """ Function to convert an email Message to standard format string/ :param email_message: email.message.Message to be converted to standard string + :param canonicalize_as_binary: force binary canonicalization :return: the standard representation of the email message in bytes """ - if email_message.get("Content-Transfer-Encoding") == "binary": + if email_message.get("Content-Transfer-Encoding") == "binary" or canonicalize_as_binary: message_header = "" message_body = email_message.get_payload(decode=True) for k, v in email_message.items(): From 0b3aeae7f4efd20c1e1a130cf094166255fc7bfb Mon Sep 17 00:00:00 2001 From: Wassilios Lytras Date: Fri, 22 Jul 2022 20:13:02 +0200 Subject: [PATCH 2/2] Formatted with black --- pyas2lib/as2.py | 5 ++++- pyas2lib/utils.py | 9 ++++++--- 2 files changed, 10 insertions(+), 4 deletions(-) diff --git a/pyas2lib/as2.py b/pyas2lib/as2.py index cd2d915..cb058ad 100644 --- a/pyas2lib/as2.py +++ b/pyas2lib/as2.py @@ -641,7 +641,10 @@ def parse(self, raw_content, find_org_cb, find_partner_cb, find_message_cb=None) # Verify the message, first using raw message and if it fails # then convert to canonical form and try again - mic_content = canonicalize(self.payload, canonicalize_as_binary=self.sender.canonicalize_as_binary) + mic_content = canonicalize( + self.payload, + canonicalize_as_binary=self.sender.canonicalize_as_binary, + ) verify_cert = self.sender.load_verify_cert() self.digest_alg = verify_message(mic_content, signature, verify_cert) diff --git a/pyas2lib/utils.py b/pyas2lib/utils.py index 5a2e999..48ad8dd 100644 --- a/pyas2lib/utils.py +++ b/pyas2lib/utils.py @@ -48,8 +48,8 @@ def _handle_text(self, msg): newline replacements. """ if ( - msg.get_content_type() == "application/octet-stream" - or msg.get("Content-Transfer-Encoding") == "binary" + msg.get_content_type() == "application/octet-stream" + or msg.get("Content-Transfer-Encoding") == "binary" ): payload = msg.get_payload(decode=True) if payload is None: @@ -84,7 +84,10 @@ def canonicalize(email_message: message.Message, canonicalize_as_binary: bool = :return: the standard representation of the email message in bytes """ - if email_message.get("Content-Transfer-Encoding") == "binary" or canonicalize_as_binary: + if ( + email_message.get("Content-Transfer-Encoding") == "binary" + or canonicalize_as_binary + ): message_header = "" message_body = email_message.get_payload(decode=True) for k, v in email_message.items():