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annotate mod_aws_profile/mod_aws_profile.lua @ 5401:c8d04ac200fc

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mod_http_oauth2: Reject loopback URIs as client_uri This really should be a proper website with info, https://localhost is not good enough. Ideally we'd validate that it's got proper DNS and is actually reachable, but triggering HTTP or even DNS lookups seems like it would carry abuse potential that would best to avoid.
author Kim Alvefur <zash@zash.se>
date Tue, 02 May 2023 16:20:55 +0200
parents 1d719d4ef18f
children 616c0459aca7
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3698
1d719d4ef18f mod_aws_profile: New module for role-based access to AWS APIs
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1 local http = require "net.http";
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2 local json = require "util.json";
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3 local parse_timestamp = require "util.datetime".parse;
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4
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5 module:set_global();
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6
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7 local current_credentials = module:shared("/*/aws_profile/credentials");
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8
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9 local function get_role_credentials(role_name, cb)
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10 http.request("http://169.254.169.254/latest/meta-data/iam/security-credentials/"..role_name, nil, function (credentials_json)
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11 local credentials = credentials_json and json.decode(credentials_json);
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12 if not credentials or not (credentials.AccessKeyId and credentials.SecretAccessKey) then
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13 module:log("warn", "Failed to fetch credentials for %q", role_name);
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14 cb(nil);
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15 return;
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16 end
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17 local expiry = parse_timestamp(credentials.Expiration);
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18 local ttl = os.difftime(expiry, os.time());
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19 cb({
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20 access_key = credentials.AccessKeyId;
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21 secret_key = credentials.SecretAccessKey;
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22 ttl = ttl;
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23 expiry = expiry;
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24 });
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25 end);
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26 end
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27
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28 local function get_credentials(cb)
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29 http.request("http://169.254.169.254/latest/meta-data/iam/security-credentials", nil, function (role_name)
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30 role_name = role_name and role_name:match("%S+");
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31 if not role_name then
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32 module:log("warn", "Unable to discover role name");
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33 cb(nil);
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34 return;
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35 end
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36 get_role_credentials(role_name, cb);
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37 end);
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38 end
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39
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40 function refresh_credentials(force)
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41 if not force and current_credentials.expiry and current_credentials.expiry - os.time() > 300 then
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42 return;
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43 end
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44 get_credentials(function (credentials)
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45 if not credentials then
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46 module:log("warn", "Failed to refresh credentials!");
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47 return;
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48 end
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49 current_credentials.access_key = credentials.access_key;
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50 current_credentials.secret_key = credentials.secret_key;
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51 current_credentials.expiry = credentials.expiry;
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52 module:timer(credentials.ttl or 240, refresh_credentials);
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53 module:fire_event("aws_profile/credentials-refreshed", current_credentials);
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54 end);
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55 end
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56
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57 function module.load()
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58 refresh_credentials(true);
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59 end