Mercurial > cgi-bin > hgweb.cgi > PassMan

annotate src/main/kotlin/name/blackcap/passman/Database.kt @ 21:ea65ab890f66

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More work to support interactive feature.
author David Barts <n5jrn@me.com>
date Tue, 02 Jul 2024 11:27:39 -0700
parents 7d80cbcb67bb
children
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1 package name.blackcap.passman
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2
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3 import java.nio.file.Files
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4 import java.nio.file.Path
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5 import java.security.GeneralSecurityException
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6 import java.security.SecureRandom
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7 import java.sql.*
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8
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9 class Database private constructor(val connection: Connection, val encryption: Encryption){
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10
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11 companion object {
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12 private const val PLAINTEXT = "This is a test."
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13 private const val SALT_LENGTH = 16
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14 private const val DEFAULT_PROMPT = "Decryption key: "
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15 lateinit var default: Database
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16
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17 fun open(passwordPrompt: String = DEFAULT_PROMPT, fileName: String = DB_FILE,
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18 create: Boolean = true): Database {
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19 val exists = Files.exists(Path.of(fileName))
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20 if (!exists) {
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21 if (create) {
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22 error("initializing database ${see(fileName)}")
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23 } else {
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24 throw DatabaseException("${see(fileName)} not found")
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25 }
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26 }
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27 val masterPassword = try {
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28 getPassword(passwordPrompt, !exists)
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29 } catch (e: ConsoleException) {
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30 throw DatabaseException(e.message, cause = e)
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31 }
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32 val conn = DriverManager.getConnection("jdbc:sqlite:$fileName")
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33 val enc = if (exists) { reuse(conn, masterPassword) } else { init(conn, masterPassword) }
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34 val ret = Database(conn, enc)
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35 verifyPassword(ret)
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36 return ret
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37 }
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38
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39 private fun reuse(connection: Connection, masterPassword: CharArray): Encryption {
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40 try {
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41 connection.prepareStatement("select value from blobs where name = ?").use {
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42 it.setString(1, "salt")
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43 val result = it.executeQuery()
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44 if (!result.next()) {
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45 throw DatabaseException("corrupt database, missing salt parameter")
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46 }
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47 val salt = result.getBytes(1)
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48 return Encryption(masterPassword, salt)
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49 }
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50 } catch (e: SQLException) {
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51 e.printStackTrace()
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52 throw DatabaseException("unable to reopen database", e)
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53 }
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54 }
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55
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56 private fun init(connection: Connection, masterPassword: CharArray): Encryption {
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57 try {
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58 connection.createStatement().use { stmt ->
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59 stmt.executeUpdate("create table integers ( name text not null, value integer )")
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60 stmt.executeUpdate("create table reals ( name text not null, value real )")
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61 stmt.executeUpdate("create table strings ( name text not null, value text )")
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62 stmt.executeUpdate("create table blobs ( name text not null, value blob )")
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63 stmt.executeUpdate(
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64 "create table passwords (" +
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65 "id integer not null primary key, " +
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66 "name blob not null, " +
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67 "username blob not null, " +
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68 "password blob not null, " +
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69 "notes blob, " +
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70 "created integer, " +
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71 "modified integer, " +
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72 "accessed integer )"
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73 )
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74 }
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75 val salt = ByteArray(SALT_LENGTH).also { SecureRandom().nextBytes(it) }
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76 val encryption = Encryption(masterPassword, salt)
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77 connection.prepareStatement("insert into blobs (name, value) values (?, ?)").use {
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78 it.setString(1, "salt")
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79 it.setBytes(2, salt)
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80 it.execute()
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81 }
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82 connection.prepareStatement("insert into blobs (name, value) values (?, ?)").use { stmt ->
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83 stmt.setString(1, "test")
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84 stmt.setEncryptedString(2, PLAINTEXT, encryption)
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85 stmt.execute()
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86 }
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87 return encryption
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88 } catch (e: SQLException) {
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89 e.printStackTrace()
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90 throw DatabaseException("unable to initialize database", e)
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91 }
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92 }
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93
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94 private fun verifyPassword(database: Database) {
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95 try {
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96 database.connection.prepareStatement("select value from blobs where name = ?").use { stmt ->
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97 stmt.setString(1, "test")
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98 val result = stmt.executeQuery()
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99 if (!result.next()) {
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100 throw DatabaseException("corrupt database, missing test parameter")
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101 }
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102 val readFromDb = result.getDecryptedString(1, database.encryption)
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103 if (readFromDb != PLAINTEXT) {
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104 /* might also get thrown by getDecryptedString if bad */
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105 throw GeneralSecurityException("bad key!")
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106 }
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107 }
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108 } catch (e: SQLException) {
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109 e.printStackTrace()
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110 throw DatabaseException("unable to verify decryption key", e)
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111 } catch (e: GeneralSecurityException) {
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112 throw DatabaseException("invalid decryption key", e)
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113 }
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114 }
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115 }
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116
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117 fun makeKey(name: String): Long = Hashing.hash(encryption.encryptFromString0(name.lowercase()))
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118 }
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119
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120 class DatabaseException(message: String, cause: Throwable? = null) : MessagedException(message, cause)
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121
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122 fun ResultSet.getDecryptedString(columnIndex: Int, encryption: Encryption): String? {
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123 return encryption.decryptToString(getBytes(columnIndex) ?: return null)
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124 }
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125
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126 fun ResultSet.getDecrypted(columnIndex: Int, encryption: Encryption): CharArray? {
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127 return encryption.decrypt(getBytes(columnIndex) ?: return null)
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128 }
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129
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130 fun PreparedStatement.setEncryptedString(columnIndex: Int, value: String?, encryption: Encryption) =
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131 if (value == null) {
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132 setNull(columnIndex, Types.BLOB)
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133 } else {
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134 setBytes(columnIndex, encryption.encryptFromString(value))
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135 }
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136
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137 fun PreparedStatement.setEncrypted(columnIndex: Int, value: CharArray?, encryption: Encryption) =
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138 if (value == null) {
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139 setNull(columnIndex, Types.BLOB)
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140 } else {
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141 setBytes(columnIndex, encryption.encrypt(value))
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142 }
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143
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144 fun PreparedStatement.setBytesOrNull(columnIndex: Int, value: ByteArray?) =
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145 if (value == null) {
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146 setNull(columnIndex, Types.BLOB)
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147 } else {
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148 setBytes(columnIndex, value)
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149 }
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150
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151 fun PreparedStatement.setLongOrNull(columnIndex: Int, value: Long?) =
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152 if (value == null) {
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153 setNull(columnIndex, Types.INTEGER)
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154 } else {
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155 setLong(columnIndex, value)
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156 }
15
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157
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158 fun PreparedStatement.setDateOrNull(parameterIndex: Int, value: Long?) {
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159 if (value == null || value == 0L) {
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160 setNull(parameterIndex, Types.INTEGER)
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161 } else {
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162 setLong(parameterIndex, value)
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163 }
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164 }
16
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165