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annotate mod_aws_profile/mod_aws_profile.lua @ 5255:001c8fdc91a4

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mod_http_oauth2: Add support for the "openid" scope This "openid" scope is there to signal access to the userinfo endpoint, which is needed for OIDC support. We don't actually check this later because the userinfo endpoint only returns info embedded in the token itself, but in the future we may want to check this more carefully.
author Kim Alvefur <zash@zash.se>
date Thu, 16 Mar 2023 17:06:35 +0100
parents 1d719d4ef18f
children 616c0459aca7
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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