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WIP: Add users system, required for uploading new pastes #77

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yorick wants to merge 8 commits from yorick/rushlink:users into master
pull from: yorick/rushlink:users
merge into: electricdusk:master
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1 changed files with 16 additions and 6 deletions
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internal/db/user.go
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@ -69,11 +69,21 @@ func Authenticate(db *gorm.DB, username string, password string) (*User, error)
const (
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mrngm commented 2023-04-30 20:07:52 +02:00
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(I would put these password-related const and funcs in a separate file, because they do nothing with regards to users)

(I would put these password-related `const` and `func`s in a separate file, because they do nothing with regards to users)
pwdSaltSize = 16
pwdHashSize = 32
pwdParams = "m=65536,t=2,p=1"
// chosen from https://cheatsheetseries.owasp.org/cheatsheets/Password_Storage_Cheat_Sheet.html
pwdMemory = 64 * 1024
pwdThreads = 1
pwdIterations = 2
pwdParams = "m=65536,t=2,p=1,v=19"
pwdVersion = "v=19"
pwdAlgo = "argon2id"
)
func HashPassword(password string) (string, error) {
if argon2.Version != 19 {
// go has no static asserts
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mrngm commented 2023-04-30 20:45:45 +02:00
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(nit: also define the 2, 64*1024, 1 in the var block above, such that you can reuse it in comparePassword; alternatively, create a function createHashFromPasswordAndSalt(password, salt []byte) []byte that does this for you... also specifying why you chose these parameters)

(nit: also define the `2`, `64*1024`, `1` in the `var` block above, such that you can reuse it in `comparePassword`; alternatively, create a function `createHashFromPasswordAndSalt(password, salt []byte) []byte` that does this for you... also specifying why you chose these parameters)
panic("Unexpected argon2 version")
}
// Generate a salt for the password hash
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mrngm commented 2023-04-30 20:23:20 +02:00
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According to the PHC format specification, padding characters are omitted. base64.URLEncoding includes padding characters. Use base64.RawURLEncoding instead.

(Technically speaking, you should use base64.RawStdEncoding, because that follows the exact alphabet as the specification. If you decide that base64.URLEncoding (or base64.RawURLEncoding) also works, then make it clear in the comment that you deviate from the specification).

According to the [PHC format specification](https://github.com/P-H-C/phc-string-format/blob/master/phc-sf-spec.md#b64), padding characters are omitted. `base64.URLEncoding` includes padding characters. Use `base64.RawURLEncoding` instead. (Technically speaking, you should use `base64.RawStdEncoding`, because that follows the exact alphabet as the specification. If you decide that `base64.URLEncoding` (or `base64.RawURLEncoding`) also works, then make it clear in the comment that you deviate from the specification).
salt := make([]byte, pwdSaltSize)
if _, err := rand.Read(salt); err != nil {
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mrngm commented 2023-04-30 20:18:04 +02:00
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Is there a specific reason you omitted the (optional) field version? The argon2 package defines one, so it seems a good idea to include that as well.

Is there a specific reason you omitted the (optional) field `version`? The `argon2` package [defines one](https://pkg.go.dev/golang.org/x/crypto/argon2#Version), so it seems a good idea to include that as well.
@ -81,22 +91,22 @@ func HashPassword(password string) (string, error) {
}
// Hash the password using argon2id
hash := argon2.IDKey([]byte(password), salt, 2, 64*1024, 1, pwdHashSize)
hash := argon2.IDKey([]byte(password), salt, pwdIterations, pwdMemory, pwdThreads, pwdHashSize)
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mrngm commented 2023-04-30 20:15:34 +02:00
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It's not safe to do a slice expression that requires at least two returned elements on a function that may return an empty slice, or a slice of length one.

It's not safe to do a slice expression that requires at least two returned elements on a function that may return an empty slice, or a slice of length one.
// Encode the salt and hash as a string in PHC format
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mrngm commented 2023-04-30 20:31:09 +02:00
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(another option: add var errInvalidDBPasswordFormat = errors.New("invalid password format in db") in the global scope, and return that here. Works nice with `errors.Is(err, errInvalidDBPasswordFormat), as I suppose we want to log such occurrences)

(another option: add `var errInvalidDBPasswordFormat = errors.New("invalid password format in db")` in the global scope, and return that here. Works nice with `errors.Is(err, errInvalidDBPasswordFormat), as I suppose we want to log such occurrences)
encodedSalt := base64.RawStdEncoding.EncodeToString(salt)
encodedHash := base64.RawStdEncoding.EncodeToString(hash)
return fmt.Sprintf("$%s$%s$%s$%s", pwdAlgo, pwdParams, encodedSalt, encodedHash), nil
return fmt.Sprintf("$%s$%s$%s$%s$%s", pwdAlgo, pwdVersion, pwdParams, encodedSalt, encodedHash), nil
}
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mrngm commented 2023-04-30 20:23:49 +02:00
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(See comment above on RawURLEncoding)

(See comment above on `RawURLEncoding`)
var errInvalidDBPasswordFormat = errors.New("invalid password format in db")
func comparePassword(hashedPassword string, password string) (bool, error) {
// Extract the salt and hash from the hashed password string
fields := strings.Split(hashedPassword, "$")
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mrngm commented 2023-04-30 20:31:46 +02:00
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(Idem)

(Idem)
if len(fields) != 5 || fields[1] != pwdAlgo || fields[2] != pwdParams {
if len(fields) != 6 || fields[1] != pwdAlgo || fields[2] != pwdVersion || fields[3] != pwdParams {
return false, errInvalidDBPasswordFormat
}
encodedSalt, encodedHash := fields[3], fields[4]
encodedSalt, encodedHash := fields[4], fields[5]
// Decode the salt and hash from base64
salt, err := base64.RawStdEncoding.DecodeString(encodedSalt)
@ -109,7 +119,7 @@ func comparePassword(hashedPassword string, password string) (bool, error) {
}
// Hash the password using the extracted salt and parameters
computedHash := argon2.IDKey([]byte(password), salt, 2, 64*1024, 1, pwdHashSize)
computedHash := argon2.IDKey([]byte(password), salt, pwdIterations, pwdMemory, pwdThreads, pwdHashSize)
// Compare the computed hash with the stored hash
return subtle.ConstantTimeCompare(hash, computedHash) == 1, nil