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194 lines
8.1 KiB
194 lines
8.1 KiB
\documentclass[11pt]{article}
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%Gummi|065|=)
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\title{\textbf{}}
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\usepackage{graphicx}
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\usepackage{caption }
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\author{Steak Electronics}
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%\date{06/4/19}
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\begin{document}
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%\maketitle
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\textbf{Email Stuff}
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\vspace{0.2in}
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%\textbf{Todo}
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\section{Manual Email Server Interaction}
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How to send emails manually. This is essential for troubleshooting automated email systems.
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\section{Basics}
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\begin{verbatim}
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openssl s_client -debug -starttls smtp -crlf -connect smtp.emailprovider.com:465
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then continue with
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EHLO hostname
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AUTH
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etc...
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\end{verbatim}
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Here's an example:
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\begin{verbatim}
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Compression: NONE
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Expansion: NONE
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No ALPN negotiated
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SSL-Session:
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Protocol : TLSv1.2
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Cipher : ECDHE-RSA-AES128-GCM-SHA256
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Session-ID: 480E968D62206D936801683C3BB12679DCB5CEDB0B20F4C3C2EB9DC97A54FAF4
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Session-ID-ctx:
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Master-Key: BAB3C9AD7E209D2A979A621731BCB6A0B4368EEE03E2B99CF884D2671E2D62A1A365EEB50FC881CA2E4FD666082027BA
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Key-Arg : None
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PSK identity: None
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PSK identity hint: None
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SRP username: None
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TLS session ticket lifetime hint: 300 (seconds)
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TLS session ticket:
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0000 - 26 e3 0c d9 a7 0e b1 88-52 ce 35 aa a0 8d bd 40 &.......R.5....@
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0010 - 0c 39 e4 60 04 59 06 bb-b2 7e 35 f9 56 36 d1 46 .9.`.Y...~5.V6.F
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0020 - d2 8c 48 29 44 fa 9f 2b-cd af fc 9a 68 b0 b8 63 ..H)D..+....h..c
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0030 - 35 06 cd ba 67 57 bf c4-84 19 5a 05 fd a7 62 51 5...gW....Z...bQ
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0040 - 1c 63 d7 b0 b4 ce 62 9f-66 13 7b 4c 74 54 86 fa .c....b.f.{LtT..
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0050 - 3b 31 e1 e1 bd 19 29 e8-76 c2 6c 45 db 1d 32 50 ;1....).v.lE..2P
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0060 - 60 63 ec 38 a3 e5 de 26-d6 27 c6 26 60 09 1a 59 `c.8...&.'.&`..Y
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0070 - 59 e9 97 b4 07 9f 6c fc-46 cb 9e 0b 40 57 8f 71 Y.....l.F...@W.q
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0080 - 20 98 54 06 38 42 47 c1-e6 fd 74 92 dc 11 a5 97 .T.8BG...t.....
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0090 - 5d 81 7e 0b 66 b7 8e aa-c0 61 48 0c 90 84 ac 2d ].~.f....aH....-
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Start Time: 1590893833
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Timeout : 300 (sec)
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Verify return code: 0 (ok)
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---
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250 PIPELINING
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EHLO localhost
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write to 0x1c0dd20 [0x1c17853] (45 bytes => 45 (0x2D))
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0000 - 17 03 03 00 28 2a 65 16-62 f5 2c 8c e5 d9 f2 ef ....(*e.b.,.....
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0010 - bb 8a ac 3a 6a dc db 32-79 56 7f 86 90 2e ed 44 ...:j..2yV.....D
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0020 - 6e 6a ea 12 64 bb f8 1e-95 7e 63 16 c5 nj..d....~c..
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read from 0x1c0dd20 [0x1c13303] (5 bytes => 5 (0x5))
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0000 - 17 03 03 00 a7 .....
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read from 0x1c0dd20 [0x1c13308] (167 bytes => 167 (0xA7))
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0000 - 80 ae b0 b8 00 a2 d6 6b-47 42 2c 5d 30 1c 04 bd .......kGB,]0...
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0010 - 5c bb 84 61 20 5a 2e 0d-c5 79 28 a9 21 d6 ad 1b \..a Z...y(.!...
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0020 - 99 e5 fc da a1 fb da bc-70 9e 9b ac 5a e1 0f 8e ........p...Z...
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0030 - bb c8 6d cb 2e 27 af 9b-4a 6a e8 17 69 31 63 14 ..m..'..Jj..i1c.
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0040 - 24 68 d7 6b cc a7 dc 24-7c d6 4b fa 2a 3e 38 61 $h.k...$|.K.*>8a
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0050 - 58 57 4d e8 1c e7 66 3c-22 0f 07 62 42 14 e7 78 XWM...f<"..bB..x
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0060 - 86 8a 6c 6f 8f 79 06 f6-dc 33 b5 e9 ec db b8 b4 ..lo.y...3......
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0070 - 0e 7d d7 08 17 cd 4d b3-ac 16 79 08 87 df 31 95 .}....M...y...1.
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0080 - 03 8d 9e 8c 25 09 ca 38-d0 be ee 45 38 d8 c4 a5 ....%..8...E8...
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0090 - c3 90 44 23 5d e7 9b 1b-c0 40 d2 cc 40 c5 4a e4 ..D#]....@..@.J.
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00a0 - 25 38 8b 05 2f b2 33 %8../.3
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250-www192.vfemail.net
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250-8BITMIME
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250-AUTH PLAIN
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250-BURL imap
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250-CHUNKING
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250-ENHANCEDSTATUSCODES
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250-SIZE 78643200
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250 PIPELINING
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\end{verbatim}
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Here you might enter at the prompt
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\\
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\\
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AUTH LOGIN
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But that will fail:
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\begin{verbatim}
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AUTH LOGIN
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write to 0x1c0dd20 [0x1c17853] (41 bytes => 41 (0x29))
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0000 - 17 03 03 00 24 2a 65 16-62 f5 2c 8c e6 59 01 74 ....$*e.b.,..Y.t
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0010 - 10 99 f5 d2 e6 75 88 d3-b9 58 0e 92 78 fc f1 ad .....u...X..x...
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0020 - c6 aa 50 2a 6c f4 cf e5-dd ..P*l....
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read from 0x1c0dd20 [0x1c13303] (5 bytes => 5 (0x5))
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0000 - 17 03 03 00 3a ....:
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read from 0x1c0dd20 [0x1c13308] (58 bytes => 58 (0x3A))
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0000 - 80 ae b0 b8 00 a2 d6 6c-bf e5 f8 3d 5a 39 93 2b .......l...=Z9.+
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0010 - f8 a2 12 03 0f 0f 5c a3-95 0a 6c b6 d9 fa 3d 09 ......\...l...=.
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0020 - 73 f7 5c 26 8c 41 aa cf-87 0f 65 61 52 7d ec f7 s.\&.A....eaR}..
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0030 - 4a fe cd a4 f8 3e be 48-a3 92 J....>.H..
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504 5.5.4 Authentication failed.
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\end{verbatim}
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If you look at the EHLO, it responds with what auth it supports. In this case, AUTH PLAIN. So it accepts plain text passwords (over an encrypted session of course).
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Unfortunately, ssmtp (which I'm using) doesn't support plain. from ssmtp manual:
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Specifies mechanism for SMTP authentication. (Only LOGIN and CRAM-MD5)
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If you instead type AUTH PLAIN or auth plain, it will respond with 334. It is then waiting for credentials.
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\begin{verbatim}
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ref: https://wiki.zoneminder.com/SMS_Notifications
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\end{verbatim}
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You can also compare logs in /var/log/mail.log
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Here's a working example:
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\begin{verbatim}
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Jun 16 01:01:02 server sSMTP[19958]: Creating SSL connection to host
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Jun 16 01:01:02 server sSMTP[19958]: SSL connection using DHE_RSA_AES_256_CBC_SHA1
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Jun 16 01:01:04 server sSMTP[19958]: Sent mail for .com (221 2.0.0 Bye) uid=0 username=root outbytes=91617
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Jun 16 01:01:04 server sSMTP[19978]: Creating SSL connection to host
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Jun 16 01:01:05 server sSMTP[19978]: SSL connection using DHE_RSA_AES_256_CBC_SHA1
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Jun 16 01:01:06 server sSMTP[19978]: Sent mail for .com (221 2.0.0 Bye) uid=0 username=root outbytes=93751
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Jun 18 13:30:31 server sSMTP[18220]: Creating SSL connection to host
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Jun 18 13:30:32 server sSMTP[18220]: 220 smtp.mxes.net ESMTP Postfix 03
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Jun 18 13:30:32 server sSMTP[18220]: EHLO s.com
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Jun 18 13:30:32 server sSMTP[18220]: 250 CHUNKING
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Jun 18 13:30:32 server sSMTP[18220]: STARTTLS
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Jun 18 13:30:32 server sSMTP[18220]: 220 2.0.0 Ready to start TLS
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Jun 18 13:30:32 server sSMTP[18220]: SSL connection using DHE_RSA_AES_256_CBC_SHA1
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Jun 18 13:30:32 server sSMTP[18220]: EHLO s.com
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Jun 18 13:30:32 server sSMTP[18220]: 250 CHUNKING
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Jun 18 13:30:32 server sSMTP[18220]: AUTH LOGIN
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Jun 18 13:30:32 server sSMTP[18220]: 334 lslslsls
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Jun 18 13:30:32 server sSMTP[18220]: somethuing
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Jun 18 13:30:32 server sSMTP[18220]: 334 something else6
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Jun 18 13:30:32 server sSMTP[18220]: somehashedstuff
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Jun 18 13:30:32 server sSMTP[18220]: 235 2.7.0 Authentication successful
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Jun 18 13:30:32 server sSMTP[18220]: MAIL FROM:<person@some.com>
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Jun 18 13:30:32 server sSMTP[18220]: 250 2.1.0 Ok
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Jun 18 13:30:32 server sSMTP[18220]: RCPT TO:<fgdfg>
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Jun 18 13:30:33 server sSMTP[18220]: 250 2.1.5 Ok
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Jun 18 13:30:33 server sSMTP[18220]: DATA
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Jun 18 13:30:33 server sSMTP[18220]: 354 End data with <CR><LF>.<CR><LF>
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Jun 18 13:30:33 server sSMTP[18220]: Received: by .com (sSMTP sendmail emulation); Thu, 18 Jun 2020 13:30:30 -0400
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Jun 18 13:30:33 server sSMTP[18220]: From: "C" <c@com>
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Jun 18 13:30:33 server sSMTP[18220]: Date: Thu, 18 Jun 2020 13:30:30 -0400
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Jun 18 13:30:33 server sSMTP[18220]: To: j
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Jun 18 13:30:33 server sSMTP[18220]: Subject: My email check
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Jun 18 13:30:33 server sSMTP[18220]:
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Jun 18 13:30:33 server sSMTP[18220]: Hello, World
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Jun 18 13:30:34 server sSMTP[18220]: .
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Jun 18 13:30:34 server sSMTP[18220]: 250 2.0.0 Ok: queued as 3B1D6759AF
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Jun 18 13:30:34 server sSMTP[18220]: QUIT
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Jun 18 13:30:34 server sSMTP[18220]: 221 2.0.0 Bye
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Jun 18 13:30:34 server sSMTP[18220]: Sent mail for c (221 2.0.0 Bye) uid=1000 username=c outbytes=439
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\end{verbatim}
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Here is another non working one.
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\begin{verbatim}
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Jun 18 17:35:46 zmctankhome sSMTP[22488]: Set MailHub="smtp.mxes.net"
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Jun 18 17:35:46 zmctankhome sSMTP[22488]: via SMTP Port Number="587"
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Jun 18 17:35:47 zmctankhome sSMTP[22488]: Creating SSL connection to host
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Jun 18 17:35:47 zmctankhome sSMTP[22488]: 220 smtp.mxes.net ESMTP Postfix 03
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Jun 18 17:35:47 zmctankhome sSMTP[22488]: EHLO .com
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Jun 18 17:35:47 zmctankhome sSMTP[22488]: 250 CHUNKING
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Jun 18 17:35:47 zmctankhome sSMTP[22488]: STARTTLS
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Jun 18 17:35:47 zmctankhome sSMTP[22488]: 220 2.0.0 Ready to start TLS
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Jun 18 17:35:48 zmctankhome sSMTP[22488]: SSL connection using ECDHE_RSA_AES_256_GCM_SHA384
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Jun 18 17:35:48 zmctankhome sSMTP[22488]: EHLO .com
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Jun 18 17:35:48 zmctankhome sSMTP[22488]:
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Jun 18 17:35:48 zmctankhome sSMTP[22488]: (.com)
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\end{verbatim}
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Notice the TLS / SSL encryption is different. That can be a deal breaker. Ouch. Otherwise both are Debian (one is 9, the other 10).
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\end{document}
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