spamassassin test

server/Dockerfile

@@ -4,13 +4,16 @@ WORKDIR /usr/src/app
 
 COPY requirements.txt ./
 RUN pip install --no-cache-dir -r requirements.txt
-RUN apk add python3-dev build-base linux-headers pcre-dev
+RUN apk add python3-dev build-base linux-headers pcre-dev spamassassin
 RUN pip install uwsgi
+#spamassassin_client
 
 ENV UID=0
 ENV MOUNT=/
 
-COPY ./main.py ./
+# Since the package maintainer doesnt merge PR
+# https://github.com/petermat/spamassassin_client/pull/2
+COPY ./main.py ./spamassassin/spamassasin_client.py ./
 
 # I juste wanted to change the socket owner but it turned out I needed to change thu uwsgi user
 #CMD uwsgi --exec-asap 'chown $UID:$UID /tmp/uwsgi/ ; mkdir -p $BASE_PATH && chown $UID:$UID $BASE_PATH' -s /tmp/uwsgi/uwsgi.sock --uid $UID --manage-script-name --mount /=server:app

server/main.py

@@ -14,6 +14,7 @@ import random, string # for tokens
 import html # for sanitization
 from bson.json_util import dumps
 import datetime # For email date
+from spamassasin_client import SpamAssassin
 
 
 ##################################################### Bottle stuff ############################################
@@ -136,7 +137,10 @@ def submission ():
     content = re.sub(form_regex, r'{\1}', form['content']).format(**content_fields)
 
     try:
-        if not send_mail(from_address, form['mail'], subject, content):
+        msg = build_mail(from_address, form['mail'], subject, content)
+        if is_spam(msg):
+            return resp(400, 'Votre message semble être du spam !')
+        if not send_mail(form['mail'], msg):
             return resp(500, 'Le mail n’a pas pu être envoyé.')
     except smtplib.SMTPDataError as e:
         response.status = 500
@@ -178,8 +182,7 @@ def fill_fields(request, fields):
             raise MissingParameterException("Le champs {} est obligatoire".format(field))
     return fields
 
-def send_mail (from_address, to, subject, content):
+def build_mail(from_address, to, subject, content):
-    """Actually connect to smtp server, build a message object and send it as a mail"""
     msg = EmailMessage()
     msg['From'] = smtp_server_sender
     msg.add_header('reply-to', from_address)
@@ -189,8 +192,16 @@ def send_mail (from_address, to, subject, content):
     msg.set_content(MIMEText(content, 'plain', "utf-8"))
     #or
     #msg.set_content(content)
+    return msg
+
+def is_spam(msg):
+    assassin = SpamAssassin(msg.as_string().encode(), 'spamassassin')
+    return assassin.is_spam()
+
+def send_mail (to, msg):
+    """Actually connect to smtp server and send the mail"""
     if do_not_send:
-        print('------------------------------------ Following message wont be sent ------------------------------------')
+        print('-------------------------- Following message sent. But only to stdout ----------------------------------')
         print(msg.as_string())
         print('--------------------------------------------------------------------------------------------------------')
         return True

server/spamassassin/readme

@@ -0,0 +1,2 @@
+Since the package maintainer doesnt merge PR
+https://github.com/petermat/spamassassin_client/pull/2

server/spamassassin/spamassasin_client.py

@@ -0,0 +1,115 @@
+import socket, select, re, logging
+from io import BytesIO
+
+divider_pattern = re.compile(br'^(.*?)\r?\n(.*?)\r?\n\r?\n', re.DOTALL)
+first_line_pattern = re.compile(br'^SPAMD/[^ ]+ 0 EX_OK$')
+
+
+class SpamAssassin(object):
+    def __init__(self, message, host='127.0.0.1', port=783, timeout=20):
+        self.score = None
+        self.symbols = None
+
+        # Connecting
+        client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+        client.settimeout(timeout)
+        client.connect((host, port))
+
+        # Sending
+        client.sendall(self._build_message(message))
+        client.shutdown(socket.SHUT_WR)
+
+        # Reading
+        resfp = BytesIO()
+        while True:
+            ready = select.select([client], [], [], timeout)
+            if ready[0] is None:
+                # Kill with Timeout!
+                logging.info('[SpamAssassin] - Timeout ({0}s)!'.format(str(timeout)))
+                break
+
+            data = client.recv(4096)
+            if data == b'':
+                break
+
+            resfp.write(data)
+
+        # Closing
+        client.close()
+        client = None
+
+        self._parse_response(resfp.getvalue())
+
+    def _build_message(self, message):
+        reqfp = BytesIO()
+        data_len = str(len(message)).encode()
+        reqfp.write(b'REPORT SPAMC/1.2\r\n')
+        reqfp.write(b'Content-Length: ' + data_len + b'\r\n')
+        reqfp.write(b'User: cx42\r\n\r\n')
+        reqfp.write(message)
+        return reqfp.getvalue()
+
+    def _parse_response(self, response):
+        if response == b'':
+            logging.info("[SPAM ASSASSIN] Empty response")
+            return None
+
+        match = divider_pattern.match(response)
+        if not match:
+            logging.error("[SPAM ASSASSIN] Response error:")
+            logging.error(response)
+            return None
+
+        first_line = match.group(1)
+        headers = match.group(2)
+        body = response[match.end(0):]
+
+        # Checking response is good
+        match = first_line_pattern.match(first_line)
+        if not match:
+            logging.error("[SPAM ASSASSIN] invalid response:")
+            logging.error(first_line)
+            return None
+
+        report_list = [s.strip() for s in body.decode('utf-8').strip().split('\n')]
+        linebreak_num = report_list.index([s for s in report_list if "---" in s][0])
+        tablelists = [s for s in report_list[linebreak_num + 1:]]
+
+        self.report_fulltext = '\n'.join(report_list)
+
+
+        # join line when current one is only wrap of previous
+        tablelists_temp = []
+        if tablelists:
+            for counter, tablelist in enumerate(tablelists):
+                if len(tablelist)>1:
+                    if (tablelist[0].isnumeric() or tablelist[0] == '-') and (tablelist[1].isnumeric() or tablelist[1] == '.'):
+                        tablelists_temp.append(tablelist)
+                    else:
+                        if tablelists_temp:
+                            tablelists_temp[-1] += " " + tablelist
+        tablelists = tablelists_temp
+
+        # create final json
+        self.report_json = dict()
+        for tablelist in tablelists:
+            wordlist = re.split('\s+', tablelist)
+            self.report_json[wordlist[1]] = {'partscore': float(wordlist[0]), 'description': ' '.join(wordlist[1:])}
+
+        headers = headers.decode('utf-8').replace(' ', '').replace(':', ';').replace('/', ';').split(';')
+        self.score = float(headers[2])
+
+    def get_report_json(self):
+        return self.report_json
+
+    def get_score(self):
+        return self.score
+
+    def is_spam(self, level=5):
+        return self.score is None or self.score > level
+
+    def get_fulltext(self):
+        return self.report_fulltext
+
+
+

server/spamassassin/spamassassin_client

@@ -0,0 +1,383 @@
+%!PS-Adobe-3.0
+%%Creator: (ImageMagick)
+%%Title: (spamassassin_client)
+%%CreationDate: (2021-05-17T23:08:26+00:00)
+%%BoundingBox: 428 345 508 391
+%%HiResBoundingBox: 428 345 508 391
+%%DocumentData: Clean7Bit
+%%LanguageLevel: 1
+%%Orientation: Portrait
+%%PageOrder: Ascend
+%%Pages: 1
+%%EndComments
+
+%%BeginDefaults
+%%EndDefaults
+
+%%BeginProlog
+%
+% Display a color image.  The image is displayed in color on
+% Postscript viewers or printers that support color, otherwise
+% it is displayed as grayscale.
+%
+/DirectClassPacket
+{
+  %
+  % Get a DirectClass packet.
+  %
+  % Parameters:
+  %   red.
+  %   green.
+  %   blue.
+  %   length: number of pixels minus one of this color (optional).
+  %
+  currentfile color_packet readhexstring pop pop
+  compression 0 eq
+  {
+    /number_pixels 3 def
+  }
+  {
+    currentfile byte readhexstring pop 0 get
+    /number_pixels exch 1 add 3 mul def
+  } ifelse
+  0 3 number_pixels 1 sub
+  {
+    pixels exch color_packet putinterval
+  } for
+  pixels 0 number_pixels getinterval
+} bind def
+
+/DirectClassImage
+{
+  %
+  % Display a DirectClass image.
+  %
+  systemdict /colorimage known
+  {
+    columns rows 8
+    [
+      columns 0 0
+      rows neg 0 rows
+    ]
+    { DirectClassPacket } false 3 colorimage
+  }
+  {
+    %
+    % No colorimage operator;  convert to grayscale.
+    %
+    columns rows 8
+    [
+      columns 0 0
+      rows neg 0 rows
+    ]
+    { GrayDirectClassPacket } image
+  } ifelse
+} bind def
+
+/GrayDirectClassPacket
+{
+  %
+  % Get a DirectClass packet;  convert to grayscale.
+  %
+  % Parameters:
+  %   red
+  %   green
+  %   blue
+  %   length: number of pixels minus one of this color (optional).
+  %
+  currentfile color_packet readhexstring pop pop
+  color_packet 0 get 0.299 mul
+  color_packet 1 get 0.587 mul add
+  color_packet 2 get 0.114 mul add
+  cvi
+  /gray_packet exch def
+  compression 0 eq
+  {
+    /number_pixels 1 def
+  }
+  {
+    currentfile byte readhexstring pop 0 get
+    /number_pixels exch 1 add def
+  } ifelse
+  0 1 number_pixels 1 sub
+  {
+    pixels exch gray_packet put
+  } for
+  pixels 0 number_pixels getinterval
+} bind def
+
+/GrayPseudoClassPacket
+{
+  %
+  % Get a PseudoClass packet;  convert to grayscale.
+  %
+  % Parameters:
+  %   index: index into the colormap.
+  %   length: number of pixels minus one of this color (optional).
+  %
+  currentfile byte readhexstring pop 0 get
+  /offset exch 3 mul def
+  /color_packet colormap offset 3 getinterval def
+  color_packet 0 get 0.299 mul
+  color_packet 1 get 0.587 mul add
+  color_packet 2 get 0.114 mul add
+  cvi
+  /gray_packet exch def
+  compression 0 eq
+  {
+    /number_pixels 1 def
+  }
+  {
+    currentfile byte readhexstring pop 0 get
+    /number_pixels exch 1 add def
+  } ifelse
+  0 1 number_pixels 1 sub
+  {
+    pixels exch gray_packet put
+  } for
+  pixels 0 number_pixels getinterval
+} bind def
+
+/PseudoClassPacket
+{
+  %
+  % Get a PseudoClass packet.
+  %
+  % Parameters:
+  %   index: index into the colormap.
+  %   length: number of pixels minus one of this color (optional).
+  %
+  currentfile byte readhexstring pop 0 get
+  /offset exch 3 mul def
+  /color_packet colormap offset 3 getinterval def
+  compression 0 eq
+  {
+    /number_pixels 3 def
+  }
+  {
+    currentfile byte readhexstring pop 0 get
+    /number_pixels exch 1 add 3 mul def
+  } ifelse
+  0 3 number_pixels 1 sub
+  {
+    pixels exch color_packet putinterval
+  } for
+  pixels 0 number_pixels getinterval
+} bind def
+
+/PseudoClassImage
+{
+  %
+  % Display a PseudoClass image.
+  %
+  % Parameters:
+  %   class: 0-PseudoClass or 1-Grayscale.
+  %
+  currentfile buffer readline pop
+  token pop /class exch def pop
+  class 0 gt
+  {
+    currentfile buffer readline pop
+    token pop /depth exch def pop
+    /grays columns 8 add depth sub depth mul 8 idiv string def
+    columns rows depth
+    [
+      columns 0 0
+      rows neg 0 rows
+    ]
+    { currentfile grays readhexstring pop } image
+  }
+  {
+    %
+    % Parameters:
+    %   colors: number of colors in the colormap.
+    %   colormap: red, green, blue color packets.
+    %
+    currentfile buffer readline pop
+    token pop /colors exch def pop
+    /colors colors 3 mul def
+    /colormap colors string def
+    currentfile colormap readhexstring pop pop
+    systemdict /colorimage known
+    {
+      columns rows 8
+      [
+        columns 0 0
+        rows neg 0 rows
+      ]
+      { PseudoClassPacket } false 3 colorimage
+    }
+    {
+      %
+      % No colorimage operator;  convert to grayscale.
+      %
+      columns rows 8
+      [
+        columns 0 0
+        rows neg 0 rows
+      ]
+      { GrayPseudoClassPacket } image
+    } ifelse
+  } ifelse
+} bind def
+
+/DisplayImage
+{
+  %
+  % Display a DirectClass or PseudoClass image.
+  %
+  % Parameters:
+  %   x & y translation.
+  %   x & y scale.
+  %   label pointsize.
+  %   image label.
+  %   image columns & rows.
+  %   class: 0-DirectClass or 1-PseudoClass.
+  %   compression: 0-none or 1-RunlengthEncoded.
+  %   hex color packets.
+  %
+  gsave
+  /buffer 512 string def
+  /byte 1 string def
+  /color_packet 3 string def
+  /pixels 768 string def
+
+  currentfile buffer readline pop
+  token pop /x exch def
+  token pop /y exch def pop
+  x y translate
+  currentfile buffer readline pop
+  token pop /x exch def
+  token pop /y exch def pop
+  currentfile buffer readline pop
+  token pop /pointsize exch def pop
+  x y scale
+  currentfile buffer readline pop
+  token pop /columns exch def
+  token pop /rows exch def pop
+  currentfile buffer readline pop
+  token pop /class exch def pop
+  currentfile buffer readline pop
+  token pop /compression exch def pop
+  class 0 gt { PseudoClassImage } { DirectClassImage } ifelse
+  grestore
+  showpage
+} bind def
+%%EndProlog
+%%Page:  1 1
+%%PageBoundingBox: 428 345 508 391
+DisplayImage
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+%%PageTrailer
+%%Trailer
+%%EOF

test/docker-compose.yml

@@ -10,6 +10,7 @@ services:
             - ./uwsgi:/tmp/uwsgi
         depends_on:
             - db
+            - spamassassin
         environment:
             MONGODB_HOST: db
             SMTP_SERVER_ADDRESS: toto.mail
@@ -36,3 +37,7 @@ services:
             nginx_uid: 1000
         depends_on:
             - mailer
+
+    spamassassin:
+        image: dinkel/spamassassin
+        restart: unless-stopped