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annotate schema/manage_users.sql @ 4662:a2f8b3ad237a stree-experiment

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Updated the schema version.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 14 Oct 2019 15:50:21 +0200
parents 5e38667f740c
children baabc2b2f094
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 -- This is Free Software under GNU Affero General Public License v >= 3.0
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2 -- without warranty, see README.md and license for details.
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3
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4 -- SPDX-License-Identifier: AGPL-3.0-or-later
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5 -- License-Filename: LICENSES/AGPL-3.0.txt
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6
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7 -- Copyright (C) 2018, 2019 by via donau
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8 -- – Österreichische Wasserstraßen-Gesellschaft mbH
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9 -- Software engineering by Intevation GmbH
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10
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11 -- Author(s):
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12 -- * Tom Gottfried <tom@intevation.de>
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13 -- * Sacha Teichmann <sascha.teichmann@intevation.de>
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15 --
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16 -- Functions encapsulating user management functionality and
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17 -- exposing it to appropriately privileged users
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18 --
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19
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20 CREATE OR REPLACE FUNCTION internal.check_password(
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21 pw varchar
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22 )
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23 RETURNS varchar
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24 AS $$
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25 DECLARE
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26 min_len CONSTANT int = 8;
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27 BEGIN
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28 IF char_length(pw) < min_len
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29 OR pw NOT SIMILAR TO '%[^[:alnum:]]%'
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30 OR pw NOT SIMILAR TO '%[[:digit:]]%'
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31 THEN
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32 RAISE invalid_password USING MESSAGE = 'Invalid password';
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33 ELSE
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34 RETURN pw;
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35 END IF;
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36 END;
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37 $$
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38 LANGUAGE plpgsql;
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39
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40
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41 CREATE OR REPLACE VIEW users.list_users WITH (security_barrier) AS
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42 SELECT
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43 r.rolname,
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44 p.username,
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45 CAST('' AS varchar) AS pw,
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46 p.country,
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47 p.map_extent,
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48 p.email_address
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49 FROM internal.user_profiles p
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50 JOIN pg_roles u ON p.username = u.rolname
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51 JOIN pg_auth_members a ON u.oid = a.member
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52 JOIN pg_roles r ON a.roleid = r.oid
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53 WHERE p.username = current_user
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54 OR pg_has_role('waterway_admin', 'MEMBER')
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55 AND p.country = (
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56 SELECT country FROM internal.user_profiles
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57 WHERE username = current_user)
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58 OR pg_has_role('sys_admin', 'MEMBER');
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59
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60
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61 CREATE OR REPLACE FUNCTION users.current_user_area_utm()
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62 RETURNS geometry
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63 AS $$
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64 DECLARE utm_area geometry;
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65 BEGIN
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66 SELECT ST_Union(ST_Transform(area::geometry, z))
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67 INTO STRICT utm_area
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68 FROM (SELECT area,
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69 best_utm(ST_Collect(area::geometry) OVER ()) AS z
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70 FROM users.stretches st
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71 JOIN users.stretch_countries stc
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72 ON stc.stretch_id = st.id
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73 WHERE country = (SELECT country
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74 FROM users.list_users
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75 WHERE username = current_user)) AS st;
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76 RETURN utm_area;
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77 END;
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78 $$
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79 LANGUAGE plpgsql
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80 STABLE PARALLEL SAFE;
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81
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82
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83 CREATE OR REPLACE FUNCTION users.utm_covers(g geography) RETURNS boolean AS
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84 $$
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85 SELECT ST_Covers(a, ST_Transform(g::geometry, ST_SRID(a)))
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86 FROM users.current_user_area_utm() AS a (a)
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87 $$
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88 LANGUAGE SQL
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89 STABLE PARALLEL SAFE;
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90
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91
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92 CREATE OR REPLACE FUNCTION internal.create_user() RETURNS trigger
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93 AS $$
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94 BEGIN
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95 IF NEW.map_extent IS NULL
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96 THEN
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97 NEW.map_extent = ST_Extent(CAST(area AS geometry))
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98 FROM users.stretches st
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99 JOIN users.stretch_countries stc ON stc.stretch_id = st.id
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100 WHERE stc.country = NEW.country;
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101 END IF;
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102 INSERT INTO internal.user_profiles (
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103 username, country, map_extent, email_address)
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104 VALUES (NEW.username, NEW.country, NEW.map_extent, NEW.email_address);
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105 EXECUTE format(
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106 'CREATE ROLE %I IN ROLE %I LOGIN PASSWORD %L',
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107 NEW.username,
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108 NEW.rolname,
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109 internal.check_password(NEW.pw));
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110
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111 -- Do not leak new password
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112 NEW.pw = '';
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113 RETURN NEW;
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114 END;
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115 $$
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116 LANGUAGE plpgsql
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117 SECURITY DEFINER;
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118
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119 CREATE TRIGGER create_user INSTEAD OF INSERT ON users.list_users FOR EACH ROW
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120 EXECUTE PROCEDURE internal.create_user();
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121
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122 CREATE OR REPLACE FUNCTION internal.update_metamorph() RETURNS trigger
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123 AS $$
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124 BEGIN
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125 EXECUTE format('GRANT %I TO metamorph', NEW.username);
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126 RETURN NEW;
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127 END;
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128 $$
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129 LANGUAGE plpgsql
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130 SECURITY DEFINER;
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131
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132 -- Note that PostgreSQL fires triggers for the same event in alphabetical
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133 -- order! Make sure that the new role is created before this trigger is fired.
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134 CREATE TRIGGER update_metamorph INSTEAD OF INSERT ON users.list_users
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135 FOR EACH ROW
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136 EXECUTE PROCEDURE internal.update_metamorph();
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137
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138
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139 -- Prevent roles other than sys_admin to update any user but
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140 -- themselves (affects waterway_admin)
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141 CREATE OR REPLACE FUNCTION internal.authorize_update_user() RETURNS trigger
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142 AS $$
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143 BEGIN
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144 IF OLD.username <> current_user
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145 AND NOT pg_has_role('sys_admin', 'MEMBER')
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146 THEN
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147 RETURN NULL;
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148 ELSE
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149 RETURN NEW;
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150 END IF;
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151 END;
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152 $$
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153 LANGUAGE plpgsql;
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154
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155 -- Note that PostgreSQL fires triggers for the same event in alphabetical
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156 -- order! Make sure that authorization takes place before any other trigger
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157 -- is fired that might execute otherwise unauthorized statements!
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158 CREATE TRIGGER authorize_update_user INSTEAD OF UPDATE ON users.list_users
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159 FOR EACH ROW
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160 EXECUTE PROCEDURE internal.authorize_update_user();
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161
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162
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163 CREATE OR REPLACE FUNCTION internal.update_user() RETURNS trigger
225
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164 AS $$
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165 DECLARE
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166 cur_username varchar;
225
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167 BEGIN
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168 cur_username = OLD.username;
225
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169
268
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170 UPDATE internal.user_profiles p
233
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171 SET (username, country, map_extent, email_address)
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172 = (NEW.username, NEW.country, NEW.map_extent, NEW.email_address)
225
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173 WHERE p.username = cur_username;
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174
307
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175 IF NEW.username <> cur_username
225
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176 THEN
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177 EXECUTE format(
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178 'ALTER ROLE %I RENAME TO %I', cur_username, NEW.username);
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179 cur_username = NEW.username;
225
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180 END IF;
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181
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182 IF NEW.rolname <> OLD.rolname
225
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183 THEN
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184 EXECUTE format(
307
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185 'REVOKE %I FROM %I', OLD.rolname, cur_username);
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186 EXECUTE format(
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187 'GRANT %I TO %I', NEW.rolname, cur_username);
225
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188 END IF;
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189
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190 IF NEW.pw IS NOT NULL AND NEW.pw <> ''
225
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191 THEN
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192 EXECUTE format(
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193 'ALTER ROLE %I PASSWORD %L',
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194 cur_username,
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195 internal.check_password(NEW.pw));
225
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196 END IF;
307
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197
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198 -- Do not leak new password
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199 NEW.pw = '';
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200 RETURN NEW;
225
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201 END;
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202 $$
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203 LANGUAGE plpgsql
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204 SECURITY DEFINER;
232
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205
307
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206 CREATE TRIGGER update_user INSTEAD OF UPDATE ON users.list_users FOR EACH ROW
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207 EXECUTE PROCEDURE internal.update_user();
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208
232
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209
342
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210 CREATE OR REPLACE FUNCTION internal.delete_user() RETURNS trigger
232
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211 AS $$
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212 DECLARE
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213 bid int;
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214 BEGIN
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215 -- Terminate the users backends started before the current transaction
342
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216 FOR bid IN SELECT pid FROM pg_stat_activity WHERE usename = OLD.username
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217 LOOP
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218 PERFORM pg_terminate_backend(bid);
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219 END LOOP;
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220 -- Note that any backend that might be started during the transaction
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221 -- in which this function is executed will not be terminated but lost
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222 -- without any privileges after commiting this transaction
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223
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224 -- Delete user
342
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225 EXECUTE format('DROP ROLE %I', OLD.username);
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226 DELETE FROM internal.user_profiles p
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227 WHERE p.username = OLD.username;
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228
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229 RETURN OLD;
232
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230 END;
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231 $$
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232 LANGUAGE plpgsql
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233 SECURITY DEFINER;
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234
342
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235 CREATE TRIGGER delete_user INSTEAD OF DELETE ON users.list_users FOR EACH ROW
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236 EXECUTE PROCEDURE internal.delete_user();
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237
319
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238
467
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239 -- To set a role from a hex-encoded user name (which is save from SQL injections).
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240 CREATE OR REPLACE FUNCTION public.setrole(role text) RETURNS void
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241 AS $$
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242 BEGIN
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243 IF role IS NOT NULL AND role <> '' THEN
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244 EXECUTE format('SET ROLE %I', convert_from(decode(role, 'hex'), 'UTF-8'));
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245 END IF;
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246 END;
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247 $$
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248 LANGUAGE plpgsql;
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249
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250 -- To set a role in form of a plannable statement (which is save from SQL injections).
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251 CREATE OR REPLACE FUNCTION public.setrole_plan(role text) RETURNS void
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252 AS $$
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253 BEGIN
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254 IF role IS NOT NULL AND role <> '' THEN
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255 EXECUTE format('SET ROLE %I', role);
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256 END IF;
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257 END;
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258 $$
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259 LANGUAGE plpgsql;