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mod_s2s_log_certs/mod_s2s_log_certs.lua @ 4877:adc6241e5d16
mod_measure_process: Report the enforced limit
The soft limit is what the kernel actually enforces, while the hard
limit is is how far you can change the soft limit without privileges.
Unless the process dynamically adjusts the soft limit, knowing the hard
limit is not as useful as knowing the soft limit.
Reporting the soft limit and the number of in-use FDs allows placing
alerts on expressions like 'process_open_fds / process_max_fds >= 0.95'
author | Kim Alvefur <zash@zash.se> |
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date | Tue, 18 Jan 2022 18:55:20 +0100 |
parent | 1787:663e5d923ef0 |
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1 module:set_global(); |
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2 |
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3 local dm_load = require "util.datamanager".load; |
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4 local dm_store = require "util.datamanager".store; |
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5 local datetime = require "util.datetime".datetime; |
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6 |
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7 local do_store = module:get_option_boolean(module:get_name().."_persist", false); |
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8 local digest_algo = module:get_option_string(module:get_name().."_digest", "sha1"); |
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9 |
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10 local function note_cert_digest(event) |
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11 local session, remote_host, cert = event.session, event.host, event.cert; |
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12 |
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13 if not (remote_host and cert and cert.digest) then return end; |
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14 local digest = cert:digest(digest_algo); |
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15 |
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16 local local_host = session.direction == "outgoing" and session.from_host or session.to_host; |
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17 local chain_status = session.cert_chain_status; |
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18 local identity_status = session.cert_identity_status; |
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19 |
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20 module:log("info", "%s has a %s %s certificate with %s: %s", |
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21 remote_host, |
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22 chain_status == "valid" and "trusted" or "untrusted", |
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23 identity_status or "invalid", |
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24 digest_algo:upper(), |
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25 digest:upper():gsub("..",":%0"):sub(2)); |
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26 |
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27 if do_store then |
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28 local seen_certs = dm_load(remote_host, local_host, "s2s_certs") or {}; |
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29 |
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30 digest = digest_algo..":"..digest; |
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31 local this_cert = seen_certs[digest] or { first = datetime(); times = 0; } |
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32 this_cert.last = datetime(); |
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33 this_cert.times = this_cert.times + 1; |
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34 seen_certs[digest] = this_cert; |
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35 chain_status = chain_status; |
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36 identity_status = identity_status; |
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37 dm_store(remote_host, local_host, "s2s_certs", seen_certs); |
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38 end |
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39 end |
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40 |
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41 if module.wrap_event then |
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42 -- 0.10 |
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43 module:wrap_event("s2s-check-certificate", function (handlers, event_name, event_data) |
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44 local ret = handlers(event_name, event_data); |
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45 note_cert_digest(event_data); |
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46 return ret; |
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47 end); |
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48 else |
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49 -- 0.9 |
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50 module:hook("s2s-check-certificate", note_cert_digest, 1000); |
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51 end |
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52 --[[ |
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53 function module.add_host(module) |
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54 module:hook("s2s-check-certificate", note_cert_digest, 1000); |
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55 end |
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56 ]] |