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| 1 | +// Copyright (C) 2018 G.J.R. Timmer <gjr.timmer@gmail.com>. |
| 2 | +// |
| 3 | +// Use of this source code is governed by an MIT-style |
| 4 | +// license that can be found in the LICENSE file. |
| 5 | + |
| 6 | +package sqlite3 |
| 7 | + |
| 8 | +import ( |
| 9 | + "crypto/sha1" |
| 10 | + "crypto/sha256" |
| 11 | + "crypto/sha512" |
| 12 | +) |
| 13 | + |
| 14 | +// This file provides several different implementations for the |
| 15 | +// default embedded sqlite_crypt function. |
| 16 | +// This function is uses a ceasar-cypher by default |
| 17 | +// and is used within the UserAuthentication module to encode |
| 18 | +// the password. |
| 19 | +// |
| 20 | +// The provided functions can be used as an overload to the sqlite_crypt |
| 21 | +// function through the use of the RegisterFunc on the connection. |
| 22 | +// |
| 23 | +// Because the functions can serv a purpose to an end-user |
| 24 | +// without using the UserAuthentication module |
| 25 | +// the functions are default compiled in. |
| 26 | +// |
| 27 | +// From SQLITE3 - user-auth.txt |
| 28 | +// The sqlite_user.pw field is encoded by a built-in SQL function |
| 29 | +// "sqlite_crypt(X,Y)". The two arguments are both BLOBs. The first argument |
| 30 | +// is the plaintext password supplied to the sqlite3_user_authenticate() |
| 31 | +// interface. The second argument is the sqlite_user.pw value and is supplied |
| 32 | +// so that the function can extract the "salt" used by the password encoder. |
| 33 | +// The result of sqlite_crypt(X,Y) is another blob which is the value that |
| 34 | +// ends up being stored in sqlite_user.pw. To verify credentials X supplied |
| 35 | +// by the sqlite3_user_authenticate() routine, SQLite runs: |
| 36 | +// |
| 37 | +// sqlite_user.pw == sqlite_crypt(X, sqlite_user.pw) |
| 38 | +// |
| 39 | +// To compute an appropriate sqlite_user.pw value from a new or modified |
| 40 | +// password X, sqlite_crypt(X,NULL) is run. A new random salt is selected |
| 41 | +// when the second argument is NULL. |
| 42 | +// |
| 43 | +// The built-in version of of sqlite_crypt() uses a simple Ceasar-cypher |
| 44 | +// which prevents passwords from being revealed by searching the raw database |
| 45 | +// for ASCII text, but is otherwise trivally broken. For better password |
| 46 | +// security, the database should be encrypted using the SQLite Encryption |
| 47 | +// Extension or similar technology. Or, the application can use the |
| 48 | +// sqlite3_create_function() interface to provide an alternative |
| 49 | +// implementation of sqlite_crypt() that computes a stronger password hash, |
| 50 | +// perhaps using a cryptographic hash function like SHA1. |
| 51 | + |
| 52 | +// CryptEncoderSHA1 encodes a password with SHA1 |
| 53 | +func CryptEncoderSHA1(pass []byte, hash interface{}) []byte { |
| 54 | + h := sha1.Sum(pass) |
| 55 | + return h[:] |
| 56 | +} |
| 57 | + |
| 58 | +// CryptEncoderSSHA1 encodes a password with SHA1 with the |
| 59 | +// configured salt. |
| 60 | +func CryptEncoderSSHA1(salt string) func(pass []byte, hash interface{}) []byte { |
| 61 | + return func(pass []byte, hash interface{}) []byte { |
| 62 | + s := []byte(salt) |
| 63 | + p := append(pass, s...) |
| 64 | + h := sha1.Sum(p) |
| 65 | + return h[:] |
| 66 | + } |
| 67 | +} |
| 68 | + |
| 69 | +// CryptEncoderSHA256 encodes a password with SHA256 |
| 70 | +func CryptEncoderSHA256(pass []byte, hash interface{}) []byte { |
| 71 | + h := sha256.Sum256(pass) |
| 72 | + return h[:] |
| 73 | +} |
| 74 | + |
| 75 | +// CryptEncoderSSHA256 encodes a password with SHA256 |
| 76 | +// with the configured salt |
| 77 | +func CryptEncoderSSHA256(salt string) func(pass []byte, hash interface{}) []byte { |
| 78 | + return func(pass []byte, hash interface{}) []byte { |
| 79 | + s := []byte(salt) |
| 80 | + p := append(pass, s...) |
| 81 | + h := sha256.Sum256(p) |
| 82 | + return h[:] |
| 83 | + } |
| 84 | +} |
| 85 | + |
| 86 | +// CryptEncoderSHA384 encodes a password with SHA256 |
| 87 | +func CryptEncoderSHA384(pass []byte, hash interface{}) []byte { |
| 88 | + h := sha512.Sum384(pass) |
| 89 | + return h[:] |
| 90 | +} |
| 91 | + |
| 92 | +// CryptEncoderSSHA384 encodes a password with SHA256 |
| 93 | +// with the configured salt |
| 94 | +func CryptEncoderSSHA384(salt string) func(pass []byte, hash interface{}) []byte { |
| 95 | + return func(pass []byte, hash interface{}) []byte { |
| 96 | + s := []byte(salt) |
| 97 | + p := append(pass, s...) |
| 98 | + h := sha512.Sum384(p) |
| 99 | + return h[:] |
| 100 | + } |
| 101 | +} |
| 102 | + |
| 103 | +// CryptEncoderSHA512 encodes a password with SHA256 |
| 104 | +func CryptEncoderSHA512(pass []byte, hash interface{}) []byte { |
| 105 | + h := sha512.Sum512(pass) |
| 106 | + return h[:] |
| 107 | +} |
| 108 | + |
| 109 | +// CryptEncoderSSHA512 encodes a password with SHA256 |
| 110 | +// with the configured salt |
| 111 | +func CryptEncoderSSHA512(salt string) func(pass []byte, hash interface{}) []byte { |
| 112 | + return func(pass []byte, hash interface{}) []byte { |
| 113 | + s := []byte(salt) |
| 114 | + p := append(pass, s...) |
| 115 | + h := sha512.Sum512(p) |
| 116 | + return h[:] |
| 117 | + } |
| 118 | +} |
| 119 | + |
| 120 | +// EOF |
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