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120 lines
4 KiB
Go
120 lines
4 KiB
Go
// Copyright (C) 2018 G.J.R. Timmer <gjr.timmer@gmail.com>.
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//
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// Use of this source code is governed by an MIT-style
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// license that can be found in the LICENSE file.
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package sqlite3
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import (
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"crypto/sha1"
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"crypto/sha256"
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"crypto/sha512"
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)
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// This file provides several different implementations for the
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// default embedded sqlite_crypt function.
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// This function is uses a caesar-cypher by default
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// and is used within the UserAuthentication module to encode
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// the password.
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//
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// The provided functions can be used as an overload to the sqlite_crypt
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// function through the use of the RegisterFunc on the connection.
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//
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// Because the functions can serv a purpose to an end-user
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// without using the UserAuthentication module
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// the functions are default compiled in.
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//
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// From SQLITE3 - user-auth.txt
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// The sqlite_user.pw field is encoded by a built-in SQL function
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// "sqlite_crypt(X,Y)". The two arguments are both BLOBs. The first argument
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// is the plaintext password supplied to the sqlite3_user_authenticate()
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// interface. The second argument is the sqlite_user.pw value and is supplied
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// so that the function can extract the "salt" used by the password encoder.
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// The result of sqlite_crypt(X,Y) is another blob which is the value that
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// ends up being stored in sqlite_user.pw. To verify credentials X supplied
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// by the sqlite3_user_authenticate() routine, SQLite runs:
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//
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// sqlite_user.pw == sqlite_crypt(X, sqlite_user.pw)
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//
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// To compute an appropriate sqlite_user.pw value from a new or modified
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// password X, sqlite_crypt(X,NULL) is run. A new random salt is selected
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// when the second argument is NULL.
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//
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// The built-in version of of sqlite_crypt() uses a simple Caesar-cypher
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// which prevents passwords from being revealed by searching the raw database
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// for ASCII text, but is otherwise trivally broken. For better password
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// security, the database should be encrypted using the SQLite Encryption
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// Extension or similar technology. Or, the application can use the
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// sqlite3_create_function() interface to provide an alternative
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// implementation of sqlite_crypt() that computes a stronger password hash,
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// perhaps using a cryptographic hash function like SHA1.
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// CryptEncoderSHA1 encodes a password with SHA1
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func CryptEncoderSHA1(pass []byte, hash interface{}) []byte {
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h := sha1.Sum(pass)
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return h[:]
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}
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// CryptEncoderSSHA1 encodes a password with SHA1 with the
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// configured salt.
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func CryptEncoderSSHA1(salt string) func(pass []byte, hash interface{}) []byte {
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return func(pass []byte, hash interface{}) []byte {
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s := []byte(salt)
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p := append(pass, s...)
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h := sha1.Sum(p)
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return h[:]
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}
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}
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// CryptEncoderSHA256 encodes a password with SHA256
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func CryptEncoderSHA256(pass []byte, hash interface{}) []byte {
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h := sha256.Sum256(pass)
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return h[:]
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}
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// CryptEncoderSSHA256 encodes a password with SHA256
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// with the configured salt
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func CryptEncoderSSHA256(salt string) func(pass []byte, hash interface{}) []byte {
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return func(pass []byte, hash interface{}) []byte {
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s := []byte(salt)
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p := append(pass, s...)
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h := sha256.Sum256(p)
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return h[:]
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}
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}
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// CryptEncoderSHA384 encodes a password with SHA384
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func CryptEncoderSHA384(pass []byte, hash interface{}) []byte {
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h := sha512.Sum384(pass)
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return h[:]
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}
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// CryptEncoderSSHA384 encodes a password with SHA384
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// with the configured salt
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func CryptEncoderSSHA384(salt string) func(pass []byte, hash interface{}) []byte {
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return func(pass []byte, hash interface{}) []byte {
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s := []byte(salt)
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p := append(pass, s...)
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h := sha512.Sum384(p)
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return h[:]
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}
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}
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// CryptEncoderSHA512 encodes a password with SHA512
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func CryptEncoderSHA512(pass []byte, hash interface{}) []byte {
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h := sha512.Sum512(pass)
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return h[:]
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}
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// CryptEncoderSSHA512 encodes a password with SHA512
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// with the configured salt
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func CryptEncoderSSHA512(salt string) func(pass []byte, hash interface{}) []byte {
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return func(pass []byte, hash interface{}) []byte {
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s := []byte(salt)
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p := append(pass, s...)
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h := sha512.Sum512(p)
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return h[:]
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}
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}
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// EOF
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