Mercurial > prosody-modules
annotate mod_tls_policy/README.markdown @ 4651:8231774f5bfd
mod_cloud_notify_encrypted: Ensure body substring remains valid UTF-8
The `body:sub()` call risks splitting the string in the middle of a
multi-byte UTF-8 sequence. This should have been caught by util.stanza
validation, but that would have caused some havoc, at the very least causing
the notification to not be sent.
There have been no reports of this happening. Likely because this module
isn't widely deployed among users with languages that use many longer UTF-8
sequences.
The util.encodings.utf8.valid() function is O(n) where only the last
sequence really needs to be checked, but it's in C and expected to be fast.
| author | Kim Alvefur <zash@zash.se> |
|---|---|
| date | Sun, 22 Aug 2021 13:22:59 +0200 |
| parents | ad24f8993385 |
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| rev | line source |
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1 --- |
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mod_tls_policy/README: Fix summary so modules.prosody.im understands it
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2 summary: Cipher policy enforcement with application level error reporting |
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3 ... |
| 1842 | 4 |
| 5 # Introduction | |
| 6 | |
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7 This module arose from discussions at the XMPP Summit about enforcing |
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8 better ciphers in TLS. It may seem attractive to disallow some insecure |
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032b209bb8ff
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9 ciphers or require forward secrecy, but doing this at the TLS level |
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032b209bb8ff
mod_tls_policy/README: Reflow and strip trailing whitespace (pandoc thougt it meant explicit line breaks)
Kim Alvefur <zash@zash.se>
parents:
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10 would the user with an unhelpful "Encryption failed" message. This |
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032b209bb8ff
mod_tls_policy/README: Reflow and strip trailing whitespace (pandoc thougt it meant explicit line breaks)
Kim Alvefur <zash@zash.se>
parents:
1842
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11 module does this enforcing at the application level, allowing better |
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032b209bb8ff
mod_tls_policy/README: Reflow and strip trailing whitespace (pandoc thougt it meant explicit line breaks)
Kim Alvefur <zash@zash.se>
parents:
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12 error messages. |
| 1842 | 13 |
| 14 # Configuration | |
| 15 | |
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16 First, download and add the module to `module_enabled`. Then you can |
| 1842 | 17 decide on what policy you want to have. |
| 18 | |
| 19 Requiring ciphers with forward secrecy is the most simple to set up. | |
| 20 | |
| 21 ``` lua | |
| 22 tls_policy = "FS" -- allow only ciphers that enable forward secrecy | |
| 23 ``` | |
| 24 | |
| 25 A more complicated example: | |
| 26 | |
| 27 ``` lua | |
| 28 tls_policy = { | |
| 29 c2s = { | |
| 30 encryption = "AES"; -- Require AES (or AESGCM) encryption | |
| 31 protocol = "TLSv1.2"; -- and TLSv1.2 | |
| 32 bits = 128; -- and at least 128 bits (FIXME: remember what this meant) | |
| 33 } | |
| 34 s2s = { | |
| 35 cipher = "AESGCM"; -- Require AESGCM ciphers | |
| 36 protocol = "TLSv1.[12]"; -- and TLSv1.1 or 1.2 | |
| 37 authentication = "RSA"; -- with RSA authentication | |
| 38 }; | |
| 39 } | |
| 40 ``` | |
| 41 | |
| 42 # Compatibility | |
| 43 | |
| 44 Requires LuaSec 0.5 | |
| 45 |