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| 1 | +#!/usr/bin/env python3 |
| 2 | + |
| 3 | +# https://www.vircom.com/blog/quick-guide-of-pop3-command-line-to-type-in-telnet/ |
| 4 | +# https://electrictoolbox.com/pop3-commands/ for how pop is supposed to work... |
| 5 | +from pony.orm.core import db_decorator, get |
| 6 | +from rich import print |
| 7 | +import sys |
| 8 | +import socketserver |
| 9 | +# import glob |
| 10 | +# import toml |
| 11 | + |
| 12 | +import os |
| 13 | + |
| 14 | +import diskcache as dc |
| 15 | + |
| 16 | +import email_db as db |
| 17 | + |
| 18 | + |
| 19 | +# EMAILS = dict() |
| 20 | + |
| 21 | +# USERS = toml.load("email_user_accounts.toml") |
| 22 | + |
| 23 | +# USERS = { |
| 24 | +# "shyft": "pass", |
| 25 | +# "test": "test" |
| 26 | +# } |
| 27 | + |
| 28 | +# USERS = dc.Cache("maildb") |
| 29 | + |
| 30 | + |
| 31 | +# mail_store_path = './mail_store' |
| 32 | +# os.mkdir(mail_store_path) |
| 33 | + |
| 34 | +# USERS.set('shyft', { |
| 35 | +# 'password': 'pass', |
| 36 | +# 'messages': [ |
| 37 | +# 'json data here', |
| 38 | +# 'another json message' |
| 39 | +# ] |
| 40 | +# } |
| 41 | +# ) |
| 42 | + |
| 43 | +# keys are users |
| 44 | +# vals are lists of messages |
| 45 | + |
| 46 | +@db.db_session |
| 47 | +def get_user(username): |
| 48 | + acct = db.Account.get(username=username) |
| 49 | + if acct != None: |
| 50 | + return acct |
| 51 | + return False |
| 52 | + |
| 53 | +@db.db_session |
| 54 | +def auth_user(username, password): |
| 55 | + res= db.Account.get(username=username, password=password) |
| 56 | + if res != None: |
| 57 | + return True |
| 58 | + return False |
| 59 | + |
| 60 | +@db.db_session |
| 61 | +def format_msg(m_id): |
| 62 | + m = db.Message.get(id=m_id) |
| 63 | + if m != None: |
| 64 | + return f''' |
| 65 | +msg id: {m.id} |
| 66 | +msg timestamp: {m.timestamp} |
| 67 | +msg from: {m.msg_from} |
| 68 | +msg to: {m.msg_to} |
| 69 | +msg subject: {m.msg_subj} |
| 70 | +msg body: |
| 71 | +{m.msg_body} |
| 72 | +''' |
| 73 | + return f'invalid id {m_id}' |
| 74 | + |
| 75 | +@db.db_session |
| 76 | +def stat_msg(username): |
| 77 | + ret = [] |
| 78 | + messages = db.select(m for m in db.Message if username in m.msg_to) |
| 79 | + for m in messages: |
| 80 | + ret.append((m.id, len(m.msg_body))) |
| 81 | + # return ''.join(ret) |
| 82 | + return ret |
| 83 | + |
| 84 | +@db.db_session |
| 85 | +def summary_msg(m_id): |
| 86 | + m = db.Message.get(id=m_id) |
| 87 | + return f'\n---\n{m.id}|{m.timestamp}|{m.msg_from}|{m.msg_to}|{m.msg_subj}|{m.msg_body}' |
| 88 | + # return f'{m.id} {len(m.msg_body)}' |
| 89 | + |
| 90 | +@db.db_session |
| 91 | +def get_messages(username): |
| 92 | + ret = [] |
| 93 | + messages = db.select(m for m in db.Message if username in m.msg_to) |
| 94 | + for m in messages: |
| 95 | + ret.append(summary_msg(m.id)) |
| 96 | + # return ''.join(ret) |
| 97 | + return ret |
| 98 | + # message_files = glob.glob(f'{mail_store_path}/{username}/*.mail') |
| 99 | + |
| 100 | + # messages = [] |
| 101 | + # for file in message_files: |
| 102 | + # with open(file) as f: |
| 103 | + # messages.append(f.read()) |
| 104 | + |
| 105 | + |
| 106 | +class MailHandler(socketserver.BaseRequestHandler): |
| 107 | + """ |
| 108 | + The request handler class for our server. |
| 109 | +
|
| 110 | + It is instantiated once per connection to the server, and must |
| 111 | + override the handle() method to implement communication to the |
| 112 | + client. |
| 113 | + """ |
| 114 | + |
| 115 | + def handle(self): |
| 116 | + # self.request is the TCP socket connected to the client |
| 117 | + self.request.sendall(f"+OK POP3 maily server v13.37 ready\n\n".encode()) |
| 118 | + self.user = b"" |
| 119 | + self.logged_in = False |
| 120 | + self.messages = list() |
| 121 | + |
| 122 | + while True: |
| 123 | + try: |
| 124 | + raw = self.request.recv(1024).decode() |
| 125 | + |
| 126 | + self.data = raw.strip().split(" ") |
| 127 | + |
| 128 | + # breakpoint() |
| 129 | + # self.data = self.data.decode() |
| 130 | + print(f"{self.client_address[0]} sent: {self.data}") |
| 131 | + |
| 132 | + cmd = self.data[0] |
| 133 | + payload = "".join(self.data[1:]) |
| 134 | + # print(f"payload : {payload}") |
| 135 | + |
| 136 | + if cmd.lower() == "user": |
| 137 | + self.logged_in == False # remove this line to be a ctf challenge. read other user emails... |
| 138 | + if get_user(payload): |
| 139 | + self.user = payload |
| 140 | + self.request.sendall( |
| 141 | + b"+OK Username accepted, password please\n" |
| 142 | + ) |
| 143 | + else: |
| 144 | + self.request.sendall(b"-ERR invalid username\n") |
| 145 | + |
| 146 | + elif cmd.lower() == "pass": |
| 147 | + print(f'login attempt for user {self.user} with password {payload}') |
| 148 | + if auth_user(self.user, payload): |
| 149 | + self.logged_in = True |
| 150 | + msg = b"+OK password accepted\n" |
| 151 | + print(f"user {self.user} {msg}") |
| 152 | + get_messages(self.user) |
| 153 | + self.request.sendall(msg) |
| 154 | + |
| 155 | + elif cmd.lower() == "stat": |
| 156 | + msgs = stat_msg(self.user) |
| 157 | + self.messages = msgs |
| 158 | + status = f"logged in:{self.logged_in}\nuser: {self.user}\n" |
| 159 | + print(status) |
| 160 | + ret_msg = f"+OK {len(msgs)} {sum([len(m) for m in msgs])}\n".encode() |
| 161 | + # ret_msg = "+OK 1 1337\n".encode() |
| 162 | + print(ret_msg) |
| 163 | + self.request.sendall(ret_msg) |
| 164 | + |
| 165 | + elif cmd.lower() == "list": |
| 166 | + if self.logged_in == True: |
| 167 | + self.messages = ''.join(get_messages(self.user)) |
| 168 | + |
| 169 | + resp = f"+OK {len(self.messages)} messages\n" |
| 170 | + for msg in stat_msg(self.user): |
| 171 | + resp += f"{msg[0]} {msg[1]}\n" |
| 172 | + # resp += '\n'.join(stat_msg(self.user)) |
| 173 | + resp += ".\n" |
| 174 | + self.request.sendall(resp.encode()) |
| 175 | + else: |
| 176 | + self.request.sendall(b"-ERR Must be logged in..\n") |
| 177 | + |
| 178 | + elif cmd.lower() == "retr": |
| 179 | + if self.logged_in == True: |
| 180 | + payload = int(payload) |
| 181 | + msg = '' |
| 182 | + with db.db_session: |
| 183 | + msg = db.Message.get(id=payload) |
| 184 | + if msg != None: |
| 185 | + msg = format_msg(msg.id) |
| 186 | + if payload >= 0 and payload <= len(self.messages) and msg != None: |
| 187 | + |
| 188 | + self.request.sendall( |
| 189 | + f"+OK\n---BEGIN_MSG---\n{msg}\n---END_MSG---\n.\n".encode() |
| 190 | + ) |
| 191 | + else: |
| 192 | + pass # invalid index |
| 193 | + else: |
| 194 | + self.request.sendall(b"-ERR Must be logged in..\n") |
| 195 | + |
| 196 | + elif cmd.lower() == "top": |
| 197 | + if self.logged_in == True: |
| 198 | + if int(payload) >= 0 and int(payload) <= len(self.messages): |
| 199 | + msg = self.messages[int(payload) - 1] |
| 200 | + self.request.sendall( |
| 201 | + f"+OK\n---BEGIN_MSG---\n{msg[:100]}\n---END_MSG---\n.\n".encode() |
| 202 | + ) |
| 203 | + else: |
| 204 | + pass # invalid index |
| 205 | + else: |
| 206 | + self.request.sendall(b"-ERR Must be logged in..\n") |
| 207 | + |
| 208 | + elif cmd.lower() == "dele": |
| 209 | + if self.logged_in == True: |
| 210 | + m_id = int(payload) |
| 211 | + with db.db_session: |
| 212 | + msg = db.Message.get(id=m_id) |
| 213 | + if msg != None: |
| 214 | + # msg = self.messages.pop(int(payload) - 1) |
| 215 | + msg_str = format_msg(m_id) |
| 216 | + self.request.sendall(f"+OK Deleted msg {m_id}\n---BEGIN_MSG---\n{msg_str}\n---END_MSG---\n.\n".encode()) |
| 217 | + msg.delete() |
| 218 | + print(f'deleted msg id {m_id}') |
| 219 | + else: |
| 220 | + self.request.sendall(b"-ERR Must be logged in..\n") |
| 221 | + elif cmd.lower() == "quit": |
| 222 | + self.request.sendall(b"+OK BYE\n") |
| 223 | + break |
| 224 | + else: |
| 225 | + self.request.sendall(b"-ERR Unknown command... try again\n") |
| 226 | + |
| 227 | + except BrokenPipeError as e: |
| 228 | + return |
| 229 | + except BaseException as e: |
| 230 | + print(e) |
| 231 | + |
| 232 | + |
| 233 | +if __name__ == "__main__": |
| 234 | + HOST, PORT = "localhost", 1110 |
| 235 | + |
| 236 | + # Create the server, binding to localhost on port 9999 |
| 237 | + with socketserver.TCPServer((HOST, PORT), MailHandler) as server: |
| 238 | + # Activate the server; this will keep running until you |
| 239 | + # interrupt the program with Ctrl-C |
| 240 | + print("Running on", HOST, PORT) |
| 241 | + try: |
| 242 | + server.allow_reuse_address = True |
| 243 | + server.serve_forever() |
| 244 | + except KeyboardInterrupt as e: |
| 245 | + print("quitting... ") |
| 246 | + server.server_close() |
| 247 | + sys.exit(0) |
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