prosody
b6aaab0846fe
plugins/mod_tokenauth.lua

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plugins/mod_tokenauth.lua @ 13112:b6aaab0846fe

util.sasl.oauthbearer: Tighter parsing of SASL message Previously the kvsep before and after the kvpairs would have been included in kvpairs, which is incorrect but should be harmless.
author Kim Alvefur <zash@zash.se>
date Fri, 26 May 2023 17:39:53 +0200
parent 13099:a1ba503610ed
child 13209:c8d949cf6b09
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 local base64 = require "prosody.util.encodings".base64;
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2 local hashes = require "prosody.util.hashes";
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3 local id = require "prosody.util.id";
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4 local jid = require "prosody.util.jid";
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5 local random = require "prosody.util.random";
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6 local usermanager = require "prosody.core.usermanager";
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7 local generate_identifier = require "prosody.util.id".short;
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8
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9 local token_store = module:open_store("auth_tokens", "keyval+");
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10
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11 local access_time_granularity = module:get_option_number("token_auth_access_time_granularity", 60);
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12
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13 local function select_role(username, host, role_name)
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14 if not role_name then return end
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15 local role = usermanager.get_role_by_name(role_name, host);
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16 if not role then return end
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17 if not usermanager.user_can_assume_role(username, host, role.name) then return end
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18 return role;
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19 end
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20
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21 function create_grant(actor_jid, grant_jid, grant_ttl, grant_data)
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22 grant_jid = jid.prep(grant_jid);
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23 if not actor_jid or actor_jid ~= grant_jid and not jid.compare(grant_jid, actor_jid) then
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24 module:log("debug", "Actor <%s> is not permitted to create a token granting access to JID <%s>", actor_jid, grant_jid);
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25 return nil, "not-authorized";
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26 end
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27
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28 local grant_username, grant_host, grant_resource = jid.split(grant_jid);
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29
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30 if grant_host ~= module.host then
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31 return nil, "invalid-host";
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32 end
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33
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34 local grant_id = id.short();
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35 local now = os.time();
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36
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37 local grant = {
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38 id = grant_id;
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39
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40 owner = actor_jid;
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41 created = now;
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42 expires = grant_ttl and (now + grant_ttl) or nil;
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43 accessed = now;
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44
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45 jid = grant_jid;
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46 resource = grant_resource;
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47
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48 data = grant_data;
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49
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50 -- tokens[<hash-name>..":"..<secret>] = token_info
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51 tokens = {};
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52 };
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53
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54 local ok, err = token_store:set_key(grant_username, grant_id, grant);
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55 if not ok then
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56 return nil, err;
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57 end
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58
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59 module:fire_event("token-grant-created", {
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60 id = grant_id;
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61 grant = grant;
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62 username = grant_username;
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63 host = grant_host;
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64 });
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65
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66 return grant;
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67 end
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68
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69 function create_token(grant_jid, grant, token_role, token_ttl, token_purpose, token_data)
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70 if (token_data and type(token_data) ~= "table") or (token_purpose and type(token_purpose) ~= "string") then
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71 return nil, "bad-request";
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72 end
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73 local grant_username, grant_host = jid.split(grant_jid);
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74 if grant_host ~= module.host then
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75 return nil, "invalid-host";
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76 end
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77 if type(grant) == "string" then -- lookup by id
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78 grant = token_store:get_key(grant_username, grant);
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79 if not grant then return nil; end
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80 end
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81
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82 if not grant.tokens then return nil, "internal-server-error"; end -- old-style token?
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83
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84 local now = os.time();
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85 local expires = grant.expires; -- Default to same expiry as grant
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86 if token_ttl then -- explicit lifetime requested
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87 if expires then
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88 -- Grant has an expiry, so limit to that or shorter
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89 expires = math.min(now + token_ttl, expires);
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90 else
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91 -- Grant never expires, just use whatever expiry is requested for the token
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92 expires = now + token_ttl;
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93 end
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94 end
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95
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96 local token_info = {
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97 role = token_role;
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98
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99 created = now;
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100 expires = expires;
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101 purpose = token_purpose;
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102
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103 data = token_data;
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104 };
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105
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106 local token_secret = random.bytes(18);
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107 grant.tokens["sha256:"..hashes.sha256(token_secret, true)] = token_info;
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108
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109 local ok, err = token_store:set_key(grant_username, grant.id, grant);
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110 if not ok then
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111 return nil, err;
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112 end
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113
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114 local token_string = "secret-token:"..base64.encode("2;"..grant.id..";"..token_secret..";"..grant.jid);
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115 return token_string, token_info;
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116 end
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117
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118 local function parse_token(encoded_token)
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119 if not encoded_token then return nil; end
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120 local encoded_data = encoded_token:match("^secret%-token:(.+)$");
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121 if not encoded_data then return nil; end
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122 local token = base64.decode(encoded_data);
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123 if not token then return nil; end
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124 local token_id, token_secret, token_jid = token:match("^2;([^;]+);(..................);(.+)$");
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125 if not token_id then return nil; end
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126 local token_user, token_host = jid.split(token_jid);
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127 return token_id, token_user, token_host, token_secret;
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128 end
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129
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130 local function clear_expired_grant_tokens(grant, now)
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131 local updated;
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132 now = now or os.time();
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133 for secret, token_info in pairs(grant.tokens) do
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134 local expires = token_info.expires;
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diff changeset
135 if expires and expires < now then
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diff changeset
136 grant.tokens[secret] = nil;
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diff changeset
137 updated = true;
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138 end
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diff changeset
139 end
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140 return updated;
12997
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diff changeset
141 end
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diff changeset
142
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143 local function _get_validated_grant_info(username, grant)
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144 if type(grant) == "string" then
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diff changeset
145 grant = token_store:get_key(username, grant);
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diff changeset
146 end
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diff changeset
147 if not grant or not grant.created then return nil; end
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148
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diff changeset
149 -- Invalidate grants from before last password change
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diff changeset
150 local account_info = usermanager.get_account_info(username, module.host);
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diff changeset
151 local password_updated_at = account_info and account_info.password_updated;
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diff changeset
152 if password_updated_at and grant.created < password_updated_at then
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diff changeset
153 module:log("debug", "Token grant issued before last password change, invalidating it now");
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diff changeset
154 token_store:set_key(username, grant.id, nil);
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diff changeset
155 return nil, "not-authorized";
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diff changeset
156 elseif grant.expires and grant.expires < os.time() then
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diff changeset
157 module:log("debug", "Token grant expired, cleaning up");
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diff changeset
158 token_store:set_key(username, grant.id, nil);
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diff changeset
159 return nil, "expired";
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diff changeset
160 end
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161
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162 return grant;
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163 end
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164
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165 local function _get_validated_token_info(token_id, token_user, token_host, token_secret)
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166 if token_host ~= module.host then
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diff changeset
167 return nil, "invalid-host";
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diff changeset
168 end
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169
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170 local grant, err = token_store:get_key(token_user, token_id);
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diff changeset
171 if not grant or not grant.tokens then
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172 if err then
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173 module:log("error", "Unable to read from token storage: %s", err);
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diff changeset
174 return nil, "internal-error";
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parents:
diff changeset
175 end
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diff changeset
176 module:log("warn", "Invalid token in storage (%s / %s)", token_user, token_id);
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177 return nil, "not-authorized";
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178 end
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diff changeset
179
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180 -- Check provided secret
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diff changeset
181 local secret_hash = "sha256:"..hashes.sha256(token_secret, true);
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diff changeset
182 local token_info = grant.tokens[secret_hash];
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diff changeset
183 if not token_info then
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diff changeset
184 module:log("debug", "No tokens matched the given secret");
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diff changeset
185 return nil, "not-authorized";
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diff changeset
186 end
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diff changeset
187
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diff changeset
188 -- Check expiry
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diff changeset
189 local now = os.time();
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parents: 13024
diff changeset
190 if token_info.expires and token_info.expires < now then
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diff changeset
191 module:log("debug", "Token has expired, cleaning it up");
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diff changeset
192 grant.tokens[secret_hash] = nil;
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diff changeset
193 token_store:set_key(token_user, token_id, grant);
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194 return nil, "not-authorized";
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195 end
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parents:
diff changeset
196
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197 -- Verify grant validity (expiry, etc.)
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diff changeset
198 grant = _get_validated_grant_info(token_user, grant);
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diff changeset
199 if not grant then
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diff changeset
200 return nil, "not-authorized";
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diff changeset
201 end
12742
126aefd2c4c6 mod_tokenauth: Invalidate tokens issued before most recent password change
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diff changeset
202
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diff changeset
203 -- Update last access time if necessary
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diff changeset
204 local last_accessed = grant.accessed;
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diff changeset
205 if not last_accessed or (now - last_accessed) > access_time_granularity then
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diff changeset
206 grant.accessed = now;
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diff changeset
207 clear_expired_grant_tokens(grant); -- Clear expired tokens while we're here
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diff changeset
208 token_store:set_key(token_user, token_id, grant);
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diff changeset
209 end
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diff changeset
210
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diff changeset
211 token_info.id = token_id;
601d9a375b86 mod_tokenauth: Refactor API to separate tokens and grants
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diff changeset
212 token_info.grant = grant;
601d9a375b86 mod_tokenauth: Refactor API to separate tokens and grants
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diff changeset
213 token_info.jid = grant.jid;
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diff changeset
214
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diff changeset
215 return token_info;
10668
25c84c0a66fd mod_authtokens: New module for managing auth tokens
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parents:
diff changeset
216 end
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parents:
diff changeset
217
13010
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diff changeset
218 function get_grant_info(username, grant_id)
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parents: 13009
diff changeset
219 local grant = _get_validated_grant_info(username, grant_id);
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diff changeset
220 if not grant then return nil; end
3e454af3615d mod_tokenauth: Add API to inspect individual grants or all of a user's grants
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parents: 13009
diff changeset
221
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parents: 13009
diff changeset
222 -- Caller is only interested in the grant, no need to expose token stuff to them
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diff changeset
223 grant.tokens = nil;
3e454af3615d mod_tokenauth: Add API to inspect individual grants or all of a user's grants
Matthew Wild <mwild1@gmail.com>
parents: 13009
diff changeset
224
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diff changeset
225 return grant;
3e454af3615d mod_tokenauth: Add API to inspect individual grants or all of a user's grants
Matthew Wild <mwild1@gmail.com>
parents: 13009
diff changeset
226 end
3e454af3615d mod_tokenauth: Add API to inspect individual grants or all of a user's grants
Matthew Wild <mwild1@gmail.com>
parents: 13009
diff changeset
227
3e454af3615d mod_tokenauth: Add API to inspect individual grants or all of a user's grants
Matthew Wild <mwild1@gmail.com>
parents: 13009
diff changeset
228 function get_user_grants(username)
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diff changeset
229 local grants = token_store:get(username);
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parents: 13009
diff changeset
230 if not grants then return nil; end
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parents: 13009
diff changeset
231 for grant_id, grant in pairs(grants) do
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parents: 13009
diff changeset
232 grants[grant_id] = _get_validated_grant_info(username, grant);
3e454af3615d mod_tokenauth: Add API to inspect individual grants or all of a user's grants
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parents: 13009
diff changeset
233 end
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parents: 13009
diff changeset
234 return grants;
3e454af3615d mod_tokenauth: Add API to inspect individual grants or all of a user's grants
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parents: 13009
diff changeset
235 end
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diff changeset
236
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diff changeset
237 function get_token_info(token)
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diff changeset
238 local token_id, token_user, token_host, token_secret = parse_token(token);
12649
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diff changeset
239 if not token_id then
12952
a668bc1aa39d mod_tokenauth: Log error when token validation fails
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parents: 12938
diff changeset
240 module:log("warn", "Failed to verify access token: %s", token_user);
12649
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diff changeset
241 return nil, "invalid-token-format";
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diff changeset
242 end
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diff changeset
243 return _get_validated_token_info(token_id, token_user, token_host, token_secret);
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diff changeset
244 end
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diff changeset
245
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parents: 10675
diff changeset
246 function get_token_session(token, resource)
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e331210beeb2 mod_tokenauth: Fix traceback in get_token_session()
Kim Alvefur <zash@zash.se>
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diff changeset
247 local token_id, token_user, token_host, token_secret = parse_token(token);
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diff changeset
248 if not token_id then
12952
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diff changeset
249 module:log("warn", "Failed to verify access token: %s", token_user);
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diff changeset
250 return nil, "invalid-token-format";
86e1187f6274 mod_tokenauth: New API that better fits how modules are using token auth
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parents: 10675
diff changeset
251 end
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diff changeset
252
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diff changeset
253 local token_info, err = _get_validated_token_info(token_id, token_user, token_host, token_secret);
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diff changeset
254 if not token_info then return nil, err; end
86e1187f6274 mod_tokenauth: New API that better fits how modules are using token auth
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diff changeset
255
13098
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Kim Alvefur <zash@zash.se>
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diff changeset
256 local role = select_role(token_user, token_host, token_info.role);
65d2ff6e674e mod_tokenauth: Return error instead of session for token without role
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parents: 13074
diff changeset
257 if not role then return nil, "not-authorized"; end
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diff changeset
258 return {
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diff changeset
259 username = token_user;
86e1187f6274 mod_tokenauth: New API that better fits how modules are using token auth
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diff changeset
260 host = token_host;
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diff changeset
261 resource = token_info.resource or resource or generate_identifier();
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diff changeset
262
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diff changeset
263 role = role;
12649
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diff changeset
264 };
86e1187f6274 mod_tokenauth: New API that better fits how modules are using token auth
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diff changeset
265 end
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parents: 10675
diff changeset
266
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parents:
diff changeset
267 function revoke_token(token)
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268 local token_id, token_user, token_host = parse_token(token);
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269 if not token_id then
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270 module:log("warn", "Failed to verify access token: %s", token_user);
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271 return nil, "invalid-token-format";
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272 end
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273 if token_host ~= module.host then
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274 return nil, "invalid-host";
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275 end
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276 local ok, err = token_store:set_key(token_user, token_id, nil);
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277 if not ok then
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278 return nil, err;
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279 end
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280 module:fire_event("token-grant-revoked", { id = token_id, username = token_user, host = token_host });
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281 return true;
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282 end
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283
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284 function revoke_grant(username, grant_id)
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285 local ok, err = token_store:set_key(username, grant_id, nil);
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286 if not ok then return nil, err; end
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287 module:fire_event("token-grant-revoked", { id = grant_id, username = username, host = module.host });
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288 return true;
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289 end
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290
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291 function sasl_handler(auth_provider, purpose, extra)
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292 return function (sasl, token, realm, _authzid)
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293 local token_info, err = get_token_info(token);
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294 if not token_info then
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295 module:log("debug", "SASL handler failed to verify token: %s", err);
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296 return nil, nil, extra;
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297 end
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298 local token_user, token_host, resource = jid.split(token_info.grant.jid);
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299 if realm ~= token_host or (purpose and token_info.purpose ~= purpose) then
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300 return nil, nil, extra;
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301 end
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302 if auth_provider.is_enabled and not auth_provider.is_enabled(token_user) then
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303 return true, false, token_info;
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304 end
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305 sasl.resource = resource;
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306 sasl.token_info = token_info;
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307 return token_user, true, token_info;
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308 end;
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309 end